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  • Articles  (130)
  • Analytical Chemistry and Spectroscopy  (130)
  • 1980-1984  (130)
  • 1925-1929
  • 1980  (130)
  • Physics  (130)
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  • Articles  (130)
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  • 1980-1984  (130)
  • 1925-1929
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  • 1
    Electronic Resource
    Electronic Resource
    Masthead (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980) 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090101
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  • 2
    Electronic Resource
    Electronic Resource
    Editorial (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 1-1 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090102
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  • 3
    Electronic Resource
    Electronic Resource
    An electronic modification of an automatic x-ray fluorescence spectrometer with sample loader to increase the flexibility of the measurement sequencePaper presented at the 10th conference on x-ray analytical methods, edinburgh, UK. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 2-4 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Philips PW 1450/00 or /10 automatic hardware-programmed X-ray spectrometer, when used in conjunction with the PW 1466 60 position sample loader, permits measurement of both standard and unknown using the same channel only when the ratio mode is selected. Further, a standard must be measured for every unknown. An electronic modification is described which overcomes both of these restrictions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090103
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  • 4
    Electronic Resource
    Electronic Resource
    Multielement x-ray fluorescence spectrometry of solutions (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 13-18 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The theoretical relationships between fluorescence intensity and concentration have been used for the calculation of correction constants of the Lachance--Traill and Rasberry--Heinrich equation for systems of solutions. The constants have also been calculated by means of the multivariate least--squares method. Those two alternatives have been tested on systems of Cu--Fe--Zn and Cu--Fe--Zn--Pb in 3.5% aqueous nitric acid and compared with the simple two-variable linear relationship between fluorescence intensity and concentration. The multivariate least--squares alternative gives for the Lachance--Traill method very accurate results (average relative deviation does not exceed 0.18%). In a theoretical discussion, the relationship between optimum sample concentration and solvent correction (enhancement) constant is shown. The optimum conditions for a background reading are also calculated.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090106
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the Nb—Ge content in thin films by quantitative x-ray fluorescence (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 19-24 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A method is presented for determining the relative amounts of Nb and Ge in thin films of approximately 1 μm thickness which have been deposited onto polycrystalline substrates. Quantitative X-ray fluorescence is employed using an energy-dispersive solid state detector and multichannel analyzer system. The principal problem encountered is one of calibrating the observed Ge/Nb intensity ratios in terms of atomic composition. We have used solution standards for comparison with the spectrum of selected dissolved films. The absolute compositions in the region of 25 atomic percent Ge are believed accurate to ±1 atomic percent absolute.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090107
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  • 6
    Electronic Resource
    Electronic Resource
    A peak integration method for acquiring x-ray data for on-line microprobe analysis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 48-51 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The operation of a computer system for producing on-line chemical analyses from a three-spectrometer JEOL JXA-5A electron microprobe is briefly discussed. A new method for acquiring the X-ray data by integrating the area under the peak is discussed in greater detail. The increased reliability of the results from this new method are illustrated by considering the effect of focus error on the measured count rates.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090204
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  • 7
    Electronic Resource
    Electronic Resource
    X-ray fluorescence analysis using intensive linear polarized monochromatic x-rays after bragg reflection (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 57-59 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: To obtain intense linear polarized monochromatic X-rays a single crystal where Bragg reflection occurs at an angle 2θ=90° is used. A number of suitable crystal materials is listed which fulfil the requirements of the Bragg equation for the wavelengths of standard X-ray tubes and the angular condition. As the first result of a new construction a detection limit of 1 ng Ca was determined using a Cr anode and a Ta single crystal (002) plane as polarizer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090206
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  • 8
    Electronic Resource
    Electronic Resource
    Radiometric diameter concept and exact intensities for spherical particles in x-ray fluorescence analysis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 52-56 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In X-ray fluorescence analysis the concept of radiometric diameter, d, is often introduced in considerations of the fluorescent intensity from a particulate sample. It represents the mean geometric path of the X-rays through one particle and is usually simply taken to be equal to the volume-to-area ratio of the particle. The effective radiometric path is, however, itself dependent on geometry and absorption effects. Rigorous calculations of the fluorescent intensity from a particle in the π and π/2 geometries were carried out to evaluate the errors involved. It appears that, for π geometry, the discrepancy between these exact results and the intensity calculated via the use of d does not exceed 5.2%. For the π/2 geometry, the errors are much larger and can amount to 50% in realistic cases of X-ray fluorescence analysis. These conclusions are also applicable to monolayers. The effective radiometric diameter approaches d only when absorption effects become negligible, but is smaller in other cases.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090205
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  • 9
    Electronic Resource
    Electronic Resource
    Masthead (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980) 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090301
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  • 10
    Electronic Resource
    Electronic Resource
    Optimization of trace analysis by pixe: Angular dependence of the background continuum (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 90-94 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In charged particle induced X-ray emission studies, the characteristic X-rays are superimposed on a continuous background of electromagnetic radiation. This background is a significant source of uncertainty when charged particle induced X-ray emission is used for analytical purposes. It is demonstrated that the angular distribution of secondary electron bremsstrahlung exhibits significant structure and may be exploited to improve the detection limits attainable with this method. For low-energy continuum X-rays, good agreement is obtained with predictions of the relativistic retardation model. Deviations at higher photon energies are attributed to Compton scattered γ-rays. Finally, suggestions are made regarding optimum energy and angle selections for direct application of particle induced X-ray emission as an analytical technique, especially when biological samples are investigated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090212
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  • 11
    Electronic Resource
    Electronic Resource
    Computer control of the electron probe microanalyser: The control system and some applications (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 110-118 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The ways in which the usefulness of the electron probe X-ray microanalyser is extended by computer control and the demands imposed on the computer operating system by a general purpose electron probe are discussed. Three main modes of operation are identified and a flexible operating system to meet the main requirements for these modes is described. Examples of the use of the system are given with particular emphasis on two applications which could not be tackled easily with a manually operated system: composition surveys over large areas of the sample and digital mapping techniques.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090305
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  • 12
    Electronic Resource
    Electronic Resource
    The discrimination and classification of small fragments of window and non-window glasses using energy-dispersive x-ray fluorescence spectrometryBased on a paper presented at the 8th international conference on atomic spectroscopy/xxi colloquium spectroscopicum internationale, cambridge, england, 1-6 july 1979. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 119-122 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Fifty pairs of window/non-window glasses, the samples in each pair being matched in refractive index to the fourth decimal place, have been analysed using energy-dispersive X-ray fluorescence spectrometry. The spectra, from 200μg fragments, were compared using a computer based multi-dimensional data processing system. Forty-three pairs of glasses were readily discriminated and forty-nine pairs showed significant differences at about the 5% level. The spectral data for the 100 glass samples were then examined graphically for trends in the elemental levels between the window and non-window glasses. This led to the construction of two linear combinations, namely the peak area ratio (to calcium) of iron with that of magnesium and the peak area of arsenic with refractive index. When plotted against each other these linear combinations and a selection rule allowed 95% of the glasses to be correctly classified.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090306
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  • 13
    Electronic Resource
    Electronic Resource
    Quantitative röntgenfluoreszenzanalyse mit hilfedes linearen und quadratischen hybridmodells (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 170-175 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Description / Table of Contents: Hybrid X-ray fluorescence analysis is a method of determining the quantitative composition using one single standard specimen together with fundamental parameter calculations. The unknown concentrations are calculated from a set of differential expressions representing changes of the count rate as a function of changes in the composition. In the case of linear hybrid methods, this function is approximated by a linear equation. The paper is based upon the linear hybrid model introduced by Kramer, Ebel and Tschismarov. This linear model is modified for improved determination of low concentrations. In addition, a quadratic model is developed and theoretical values are compared to experimental results.
    Notes: Das Konzept der hybriden Röntgenfluoreszenzanalytk ermöglicht die quantitative Bestimmlung einer Probenzusammensetzung mit Hilfe einzigen Standardpprobe und der Kenntnis von theoretischen Zusammenhängen im Sinne der fundamentalen Parameterrechnung. Die gesuchten Konzentrationen werden aus einem Differentialausdruck berechnet, der die Zählratenänderungen als Funktion von Konzentrationsänderungen beschreibt. Im Fall des Linermodells wird diese Funktion liner approximiert, im quadratischen Modell durch eine Funktion zweiter Ordnung. Die vorliegende Arbeit geht von dem Linearmodell aus, das von Kramer, Ebel und Tschismarov vorgestellt wurde und ergänzt es zur verbesserten Bestimmbarkeit kleiner Konzentrationen. Die Ergebnisse der Theoretischen Gegenöberstellung von linerarem und quadratischem Modell werden mit experimentellen Ergebnissen belegt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090406
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  • 14
    Electronic Resource
    Electronic Resource
    Recent developments in detectors for process control x-ray sensors (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 184-188 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The paper reviews recent developments in energy-dispersive X-ray detectors and attempts to assess their relevance to industrial process control requirements.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090408
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  • 15
    Electronic Resource
    Electronic Resource
    Estimation of the chemical composition of precipitated phase by the electron beam microanalytical technique (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 5-7 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The problem of estimating the chemical composition of small particles of a phase in a matrix of another occurs in a number of fields. The introduction of electron beam microanalytical techniques has made it possible to analyse a volume of 10μm3. In spite of this advancement the chemical composition of the particles themselves is difficult to determine. This difficulty arises from uncertainty as to the full containment of the analysed volume by the particle being analysed. In this paper a statistical approach to establish the chemical composition of the particles themselves has been proposed. This approach is particularly useful when the particles and the matrix have a common element. Two examples are given, one with components of known compositions and another with a component of an unknown composition.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090104
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  • 16
    Electronic Resource
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    The suitability of energy-dispersive electron-microprobe analysis for the investigation of stainless steels (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 8-12 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Carefully polished samples of five austenitic stainless steels have been examined by reflected light microscopy and analysed, using a Link Systems model 290 KX energy-dispersive spectrometer attached to a Cambridge Instrument Company Geoscan microprobe. At least ten different spots within apparently homogeneous areas of each sample were analysed. While the means of these analyses agree well with the published values, three of the samples have an inhomogeneous distribution of their major elements. Precipitates within the samples are mainly MnCr2O4 and MnS, both with much substitution of the Mn by other elements. Other precipitates are rich in P or Nb. While such blocks are probably sufficiently homogeneous for use as bulk standards, great care should be exercised if they are to be used as microprobe standards. A small excess of silicon was found in most analyses. This is believed to be due to fluorescent excitation of silicon in the detector. Analyses of pure metals suggest that a correction of 0.12 wt % silicon should be applied.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090105
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  • 17
    Electronic Resource
    Electronic Resource
    Studies of the non-linear rise in intensity if x-ray line (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 25-27 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A non-linear rise in intensity of copper Kα1 and Kα2 X-ray lines has been observed from certain areas of the polycrystalline copper target of a microfocus tube operated at tube currents between 0.1 and 0.5 mA and a tube potential of 13 kV. Under the same conditions the intensity rise of the bremsstrahlung is found to be linear. A functional relationship between total count and tube current has been obtained.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090108
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  • 18
    Electronic Resource
    Electronic Resource
    Photon-Induced x-ray fluorescence determination of platinum in reforming catalysts and doped venezuelan laterites (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 28-31 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A non-destructive method for the determination of platinum in reforming catalysts and doped Venezuelan laterites employing a radionuclide, 8mCi of 109Cd, and a PDP-11/05 processor is presented. The total variation for 100s of fluorescent time is about 3% for a 10% Pt-reforming catalyst. The total variation can be reduced to less than 1% by increasing the fluorescent time so that about 80 000 counts or greater are accumulated. The platinum was determined using the Lα and Lβ lines of platinum, as well as their sum. The different types of variation for each of these measuring parameters is given. Finally, both the calculated and measured values for the prepared calibration standards and the doped Venezuelan laterites were in excellent agreement.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090109
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  • 19
    Electronic Resource
    Electronic Resource
    Kβ/Kα ratios in energy-dispersive x-ray emission analysis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 32-35 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A set of most probable Kβ/Kα values estimated on the basis of all available experimental data is presented.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090110
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  • 20
    Electronic Resource
    Electronic Resource
    Masthead (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980) 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090201
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  • 21
    Electronic Resource
    Electronic Resource
    A new system for on-line x-ray topography (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 36-37 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new system for on-line X-ray topography is described, in which relative motions of separate assemblies are completely eliminated. The main elements of the system are a low-power raster-type X-ray source with a transmission target and a multi-capillary collimator. It takes about 2.5-3 min to produce a topograph of silicon single-crystal (20 × 20 × 0.3mm) when the radiation source power is only 10W.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090111
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  • 22
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    Editorial (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 39-39 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090202
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  • 23
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    X-ray fluorescence investigation of the shroud of turin (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 40-47 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: We present results of X-ray fluorescence measurements on the Shroud of Turin. Quantitative estimates are given for the observed trace quantities of calcium, iron and strontium, and detection limits are established for other elements of potential interest. The calcium and strontium appear as uniform background distributions. Iron traces are observed in all of the data spectra but their local concentrations vary. Comparisons between image and off-image areas reveal no differences, within the precision limits of the data, that would indicate the presence of pigments or dyes containing high-C elements. In ‘blood’ stain regions the measurements show significantly higher concentrations of iron. However, the data do not allow a unique identification of the stain's origin. Quantitative comparisons are made between the shroud results and similar measurements on whole blood and Fe2O3 stains.
    Additional Material: 9 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090203
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  • 24
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    X-ray diffractometry of airborne particulates deposited on membrane filtersPrepared for the us department of energy under contract no. w-7405-eng-48. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 60-65 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Methods are considered for optimizing a conventional Bragg--Brentano X-ray powder diffractometer for the identification of crystalline phases in airborne particulates deposited on membrane filters. The instrumental parameters investigated include detector stepping increment and scan range, Kβ filtration, and the incident beam divergence slit width. Sample-related factors such as substrate material (cellulose ester, polycarbonate and polytetrafluoroethylene), off-axis displacement of the sample and X-ray induced specimen degradation were also studied. Scan times for sample deposits of several hundred μcm-2 are in the vicinity of 24 h with an 800 W tube. These times may be reduced substantially by one or more of the following modifications: rotating anode or synchrotron radiation source, energy-dispersive diffractometry, and Bragg--Brentano diffractometry with a position-sensitive gas detector.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090207
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  • 25
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    Determination of the thickness of SiO2 layers on SI by X-ray spectrometry (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 66-69 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: This paper shows the employment of five X-ray methods for the investigation of a thickness range of 1 Å to 0.1 mm. The well known techniques (X-ray fluorescence and scanning electron microscopy) are treated, a new method (energy-dispersive X-ray diffraction) is discussed and X-ray photoelectron spectroscopy measurements are essentially improved by a new evaluation method. Low energy electron induced X-ray spectrometry is mentioned. As far as significance of the measured thicknesses is concerned, the range of 10--50 nm deserves special attention.
    Additional Material: 11 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090208
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  • 26
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    X-ray K absorption studies on some 1,10 phenanthroline-based cobalt complexes (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 77-80 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The X-ray K absorption edges of Co in some 1,10 phenanthroline-based complexes of cobalt have been recorded. The results have been discussed qualitatively in terms of the effective nuclear charge on the central metal atom and the nature of the ligand.
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    Automatic absorption correction in x-ray fluorescence analysis of intermediate thickness samples using a dual external reference signal (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 70-76 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A method has been investigated which allows calculations from the X-ray fluorescence spectra of the absorption coefficients at any energy for any sample, without any additional measurement. Use is made of the ratio of the characteristic X-ray signals from a Zr wire positioned in front of the sample and from a Pd foil placed behind the sample, both in a fixed geometry. From the experimentally measured absorption coefficient at the Pd L energy (2.9 keV), the coefficients for higher energies are calculated. By the use of an iterative computer routine in which corrections for the enhancement of the Pd foil by the sample are also included, an accuracy of 2% or better on the absorption coefficient determination can be reached for homogenous samples in one measurement. Grain-size and heterogeneity effects induce inaccuracies on the absorption coefficient determinations which might well reach 20% for particulate samples like intermediate thickness deposits of geological materials. This approach thus has the same limitations as the classical transmission method for such heterogeneous samples.
    Additional Material: 6 Ill.
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    Editorial (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 95-95 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090302
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    Multilayer X-ray spectrometry in the 20-80 Å region: A molecular orbital analysis of CO and CO2 in the gas and solid states (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 81-89 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Optimized multilayer X-ray spectrometry, using lead myristate and lead stearate analyzers (2d values of 80 and 100 Å) has been applied to the measurement of the O--Kα and the C--Kα spectral bands from CO and CO2 in the gas and solid phases. The LII, III spectra were also measured for argon in the gas and solid states under similar conditions in order to identify and to minimize any non-molecular components in the CO and CO2 spectra. These molecular orbital data have been related to those obtained with X-ray and ultraviolet photoelectron spectroscopy and grating X-ray spectroscopy. The consistency of the results of these complementary measurements is excellent. The ionization energies for the C and O 1s levels have been determined to be 295.4 and 542.0 eV for CO and 296.8 and 540.3 eV for CO2. The MO data have also been compared with that predicted from the symmetry, strength and binding energy of the molecular orbital spectral components as calculated using the currently available computational models, CNDO/2, MINDO/3, MNDO, extended Hückel and ab initio. The molecular orbital calculated results for these organic compounds, CO and CO2, are not in as good agreement with the experimental data as previously demonstrated for molecular orbital spectra measured for C--Kα and the LII, III bands of Cl, S and P for both organic and inorganic compounds.
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    The derivation of influence coefficients from experimental and calculated XRF dataPresented at the 11th conference on x-ray analvtical methods, durham, uk, 1978. (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 96-100 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The use of the multiple linear regression program for the derivation of influence coefficients destroys the data bank in the Philips PW 1450/10 spectrometer computer and interrupts analysis. Consideration of the basis of α-coefficients as applied to relatively dilute solutions leads to methods of avoiding the use of this program. Linear regression involving a single independent variable and simple algebraic expressions can be used to derive the coefficients. The requirements for converting α-coefficients applicable to one solvent for use in a different solvent are described.
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    The computer control of an electron probe microanalyser using camac and coral-66 (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 101-109 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A computer control system for an electron probe microanalyser has been designed using CORAL-66, a high level compiler language, for the control program and CAMAC modules for the instrument interface. The consequences of the choices made in the design are discussed. The performance of the system was measured by comparing the results from carrying out typical operations by hand and by computer control. The results showed an improvement in precision for general operation and analysis, a reduction in the time for analysis and an improvement in operator performance from using the control system.
    Additional Material: 3 Ill.
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    A method for isotope-excited X-ray fluorescence analysis of thick samples (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 123-125 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A simple equation relating the intensity of characteristic X-ray lines to their respective weight fractions has been obtained for a thick sample excited by an isotopic source. It follows from the equation that a single intense line in a standard sample suffices to generate calibration constants over a wide range of elements. Validity of this aproach has been demonstrated by the analysis of a standard soil sample using only the Fe Kα line for calibration. A procedure for correction of peak overlaps has been given using the Kβ/Kα ratios, modified by the matrix effects. The method is very useful for the analysis of soil samples and can be conveniently applied to other matrices.
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    URL: http://dx.doi.org/10.1002/xrs.1300090307
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    An in-depth study of energy-dispersive x-ray spectra (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 126-133 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A detailed study of energy-dispersive X-ray spectra is undertaken. Considerable attention is given to a method for a systematic and accurate description of the K and L spectra; a digital correction for the peak profile is evaluated. The following second order effects and spectral artefacts are investigated: radiative Auger transitions, spectral background components, Raman scattering of X-rays, silicon escape, fluorescence of the detector materials, and sum peaks.
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    Zur quantitativen mikrosondenanalyse von geologischen proben mittels kombiniertem EDS/WDS (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 134-137 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Description / Table of Contents: A method for quantitative microprobe analyses of geological samples (silicates and carbonates) is described. In the case of silicates for total analysis the need is to detect simultaneously more than 10 chemical main- and minor-constituents. For this purpose two experimental possibilities are available: (a) automatic control of the crystal scanners (sequence control); (b) combination WDS/EDS (wavelength-dispersive and energy-dispersive system). These two possibilities are discussed. Technical notes of the equipment and the analytical method are described in detail. High analytical precision can be obtained.
    Notes: Es wird eine quantitative Analysenmethode für geologische Proben (Silikate and Karbonate) mittels Röntgenmikrosonde beschrieben. Im Falle von Silikaten sind fur eine Totalanalyse mehr als 10 chemische Elemente simultan zu erfassen (Haupt-und Nebenelemente). Zwei experimentelle Moglichkeiten sind realisierbar: (a) Automatischer Sequenzbetrieb mittels Kristallspekrometern; (b) Kombination WDS/EDS (wellenlangendispersives und energiedispersives System). Diese beiden Möglichkeiten werden diskutiert. Technische Angaben und apparativer Aufwand werden beschrieben. Es wird dargelegt, auf welche Weise eine hohe analytische Genauigkeit erreicht werden kann.
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    X-ray fluorescence analysis without standards of small particles extracted from super-alloys (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 138-142 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Small amounts of particulate matter electrochemically extrated from super-alloys were accurately analysed by X-ray fluorescence spectrometry with pure element bulk standards. The extracts are less than a few hundred micrograms per square centimeter and are not homogeneous. They are approximated by a thin film on a filter substrate. The penetration of the particulates into the membrane filter on which they are mounted is negligible and no absorption correction for the filter is required. The spectral distribution of the X-ray source used in the calculation was obtained from Kramer's formula with self-absorption correction for the continuum and from measurements of the characteristic line. The intensity-concentration algorithm is based on the fundamental parameter method; the calculation is simplified because no matrix correction is required if the relative intensities are less than or equal to 0.04. The method gives excellent results in chemical analyses.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/xrs.1300090310
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    The influence of tube voltage rectification in X-ray fluorescence analysis without standards (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 143-145 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The spectral photon distribution from X-ray tubes operated at constant potential is compared to the distribution resulting from self rectification circuits. Kramers' equation is modified by calculating the average values of the photon flux during one period of voltage fluctuation and the results are used to transform Gilfrich and Birks' experimental tube spectra to those expected from a half-wave rectification circuit. The effect of using both constant potential and sine wave potential, as well as constant potential with overlaid sine wave ripple, is discussed. Results are shown by using experimental data from Ag-Au-Cu alloys and ‘no standard’ methods (data evaluation without reference specimens).
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    X-ray fluorescence analysis without standards (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 146-149 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Theory and experimental results from X-ray fluorescence analysis without standards are presented. The composition of an unknown specimen is calculated from its count rates without the use of standard specimens. A fast algorithm employing linear approximation techniques uses these normalized count rates as start values for the concentrations and delivers final results usually after the second or third iteration. Accuracy is typically around 10% relative and can be improved by system calibration with standards of arbitrary composition.
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    An x-ray source with focal spot scanning (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 150-152 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The construction of a demountable X-Ray tube with focal spot scanning intended for operation as an X-ray source in scanning X-ray microscopes is described.
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    URL: http://dx.doi.org/10.1002/xrs.1300090313
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    Masthead (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980) 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090401
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    Editorial (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 153-153 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300090402
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    Correction for matrix effects in x-ray fluorescence analysis of finite media (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 154-158 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A procedure is presented for constructing calibration curves of X-ray fluorescence activity versus analyte concentration for finite multicomponent media. The composition must be known for all components other than the low-concentration analyte. If these compositions are not known, the system's mass absorption coefficient must be measured. The analyte must be present in low enough concentration so that it does not contribute significantly to the total mass absorption coefficient. The calibration curve for a multicomponent system is constructed numerically from data on analyte activity versus secondary component composition in binary systems (analyte plus one secondary component). Thus calibration curves for any system containing the analyte and n secondary components are constructed from data on the n corresponding binary systems. The method is found to reproduce measured activities of uranium solutions with an accuracy of 5-7%.
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    X-ray emission intensities of radioisotopes produced by neutron activation (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 159-162 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The emission intensities of K X-rays from a number of activation products have been calculated from the known absolute γ intensities, K capture data and internal conversion coefficients of the radionuclides and the fluorescence yields of the daughter products. The calculated X-ray intensities of a few isotopes are compared with those experimentally reported. The X-ray spectrometry of activation products could usefully supplement the γ-ray spectrometry in the instrumental neutron activation analysis and in such cases the data presented here will be of value.
    Additional Material: 3 Tab.
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    Qualitative and quantitative analysis of technical aluminium phosphide (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 163-169 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The qualitative and quantitative composition of technical aluminium phosphide was studied employing X-ray electron spectrometry, X-ray fluorescence analysis and X-ray diffractometry as well as gravimetric and gas volumetric methods. In addition to aluminium phosphide, AIN (8%), Al(1%) and Al(OH)3 (10%) were found. Al(OH)3 is produced by the reaction of AlP with H2O. Models describing this reaction in humid air and allowing for quantitative analysis are presented.
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    Relationship between the reciprocal of analyte--line intensity and the reciprocal of weight fraction and its utilization in x-ray fluorescence analysis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 176-183 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Using the effective wavelength concept, it is derived theoretically that the reciprocal of the analyte-line intensity is linearly correlated with the reciprocal of the weight fraction of the analyte. This linear relationship is substantiated experimentally in some liquid and fusion product samples. Two ways of application of the relationship in X-ray fluorescence analysis and their advantages are also described. It is emphasized that if the relationship is used the construction of calibration curves is not required.
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    Space resolved x-ray spectroscopy for tokamak (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 189-194 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Space resolved X-ray spectroscopy with a curved crystal X-ray spectrometer for an extended source such as the Tokamak is discussed. Limits of resolution caused by instrumental broadening are shown, using various entrance apertures. Ion density distribution may be obtained by measurement of intensity variation along spectral lines. In order to obtain ion temperature distribution about the central plasma line in the Tokamak, a novel method is proposed. In this method reflection in the curved crystal takes place through the double reflection process. This is possible as practically no instrumental broadening is caused when using this method, while it reflects the radiation in a strictly space resolved mode.
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    A practical relation between atomic numbers and alpha coefficientsPresented at the 28th annual conference on applications of x-ray analysis, denver, colorado (1979). (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 195-197 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A first approximation indicates that fundamental alpha coefficients for a given analyte vary as a function of the ratio of their respective atomic number raised to a power. This simple rule applies mainly at the limits (i.e., when the weight fraction of analytei, wi is of the order of 0.0 or 1.0) in cases of absorption and weak enhancement. The relation thus provides a means of generating coefficients for the system i-k from experimental data obtained on system i-j and a means of verifying experimental alphas, since arrays of coefficients must show a high degree of concordance.
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    Analysis of geologic materials using an automated x-ray fluorescence system (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 198-205 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The use of an automated, software-controlled X-ray fluorescence spectrometer (Phillips AXS System)for analysis of geologic materials gives rapid, precise results. Fluorescence intensities are corrected for background and peak overlap and for mass absorption, and ratioed to a standard rock analyzed at frequent intervals. Major element determinations show precision and accuracy in the 0.5-3% range and are based on calibration with a wide variety of international reference rocks. Determinations for major elements are done on specially fused rock powders. Precision and accuracy for trace elements are generally in the 1-5% range. Calibration is also by use of reference rocks but the determinations are done directly on pressed rock powders.
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    Multielement thin film standards for XRF analysis (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 9 (1980), S. 206-211 
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    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Multielement thin film standards are made by mixing a solution of different elements and a radioactive tracer (24Na) with the water soluble polymer mehtylcellulose. A film is produced by spreading the liquid mixture evenly on glass plates and letting it dry. Standards of the desired size and shape are punched out. The concentrations of the elements are calculated from the tracer activity. Ten sets of standards containing the elements Na, Mg, Al, Si, P, S, Cl, K, Cs, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Br, Rb, Sr, Ag, Cd, Sn, Sb, Ba and Pb in different groupings have been prepared. Homogeneity and accuracy oof the standards are extensively discussed. The accuracy is also estimated by the alalysis of the standards using several techniques. The precision of the analysis factors derived from the standards is better than 1-2%, while the accuracy for the elements Al, Cl, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Se, Br, Sb, Ba and Pb is found to be better than 5%.
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    Benzisoxazoles -1,2 et -2,1: Analyse vibrationnelle infrarouge et Raman (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 339-343 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman (3200-100 cm-1; liquid state) and infrared spectra (4000-200 cm-1; vapour, liquid state, and dissolved in inert and proton acceptor solvents) of -1,2 and -2,1 benzisoxazoles have been recorded. Their experimental analysis have allowed a complete attribution of the fundamental vibrations and of some overtone and combination vibrations of these heterocycles.
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    Foreign-gas pressure broadening of the pure rotational Raman spectrum of H2 (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 344-346 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements of the width of the rotational Raman line, at 595 cm-1, of hydrogen in mixtures with N2, C2H4 and CO2 are reported at a series of perturbing gas pressures, up to 400 bar. The broadening is found to be characteristic of the foreign gas and is interpreted in term of the quadrupole-quadrupole interaction between hydrogen and the perturing molecule. It is shown that the quadrupole-quadrupole contribution is the dominant part of the anisotropic intermolecular potential.
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    Interference effects in the high Resolution CARS spectra of gases (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 353-360 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The CARS spectra of gas-phase molecules have contributions from both real and imaginary components of the third-order non-linear susceptibility. When the spectral lines are closely spaced as in the high-resolution CARS spectra (e.g. ˜ 0.03 cm-1) of the Q-branches of diatomic molecules, considerable interference between the lines occurs for the contribution of the real part of the susceptibility, which causes asymmetry in the band profiles. The magnitude of the interference is dependent on the bandwidths Γ which are themselves primarily due to pressure broadening at high and medium pressures and due to Doppler broadening at low pressure. In this work the CARS spectra of two individual lines and of the diatomic molecules O2, N2 and NO have been calculated for a number of different linewidths. The effects of interference wereshown to result in substantial spectral differences for the various values of Γ.
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    Vibrational dephasing of the Si—H stretching mode in liquid trichlorosilane (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 76-79 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman signal from the v1 mode of trichlorosilane has been examined by dilution in several solvents. Temperature studies were also conducted and include data from the disordered solid phase of the neat sample. The results of these studies show that (a) the v1 fundamental is involved in a dephasing process process controlled by the intramolecular potential function; (b) the neat liquid has a longer dephasing time than in any of the solvents, indicating memory retention as an intermolecular process. Additionally, environmental effects (broadening) are pronounced and appear to be related to the dipole moment of the solvent. The theoretical model proposed by Rothschild1 is used to strengthen the interpretive case offered for the dephasing mechanistic process of the fundamental.
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    Vibrational spectra and conformations of alkyl substituted three-membered ring compounds: Ethylcyclopropane, isopropylcyclopropane and ethyloxirane (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 107-114 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The infrared spectra (from 4000 to 200 cm-1) and Raman spectra of ethylcyclopropane, isopropylcyclopropane and ethyloxirane have been recorded in solid, liquid and vapor phases. From the spectral data, ethylcyclopropane has been shown to exist solely in the gauche conformation in all three states of matter. Likewise, isopropylcyclopropane exists solely in a bisected conformation having a mirror plane of symmetry. On the other hand, however, in the gas phase ethyloxirane exists as an equilibrium mixture of the two nonequivalent gauche rotameric forms. In all cases, steric repulsions between methyl hydrogens and β-ring hydrogens preclude the existence of possible conformers where a methyl group is situtated over (cis) the three-membered ring. Tentative vibrational assignments have been proposed for major spectral bands of all three molecules.
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    pH-induced modification of NAD and NADH solutions detected by Raman spectroscopy (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 130-133 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Analysis of the Raman spectra of NAD and NADH indicates that the intensity characteristic of a band at ˜ 1400 cm-1, assigned to the nicotinamide ring vibrations, demonstrates interactive effects correlated with conformational changes of NAD in basic phosphate solutions and NADH in acid phosphate solutions. The Raman lines of these dinucleotides are discussed with respect to the spectra of the individual bases and previous Raman studies of nucleotides. The data reported provide the groundwork for future application of the Raman technique to NAD and NADH reactions.
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    Masthead (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980) 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
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    Raman spectra of chemisorbed bromine and iodine on zeolites (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 155-156 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of bromine and iodine adsorbed on 5A and 13X zeolites from carbon tetrachloride solutions presented bands that were assigned to chemical and physical adsorption. Using a rotating cell and an oscillating optical system it was possible, choosing a convenient laser power, to aid the bands due to chemisorption.
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    Selective ultraviolet resonance Raman excitation of individual chromophores in nicotinamide adenine dinucleotide (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 372-375 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ultraviolet resonance Raman spectra (UVRRS) of reduced nicotinamide adenine dinucleotide (NADH) has been taken with ultraviolet laser excitation wavelengths (λe) of 273 nm, 330 nm and 351.1 nm. These Raman spectra have been compared with the resonance Raman spectra of the model compounds adenosine mononucleotide phosphate (AMP), with λe = 300 nm, and with reduced methyl nicotinamide (MNH), with λe = 351.1 nm, and with the classical Raman spectrum of NADH, with λe = 514.5 nm. The UVRR spectrum of NADH with λe = 273 nm resembles exclusively that of AMP while the UVRR spectra with λe = 330 nm and λe = 351.1 nm show no AMP bands but only those of MNH. The classical Raman spectrum of NADH is shown to be a superposition of bands in the resonance Raman spectra of the two chromophores but includes as well the sugar-phosphate bands. Thus it is possible selectively to excite a UVRRS of either chromophore independently of the other. This information may prove helpful in developing techniques of UVRRS in studying NADH-enzyme complexes since only very dilute (˜5×10-4 M) concentrations of NADH are needed for the resonant Raman spectra.
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    Raman intensities, vibrational eigenvectors, electro-optical parameters and force constants of SO42-, ClO4-, PO43, CO32- and NO3- anions in polycrystalline samples (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 386-392 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The relative Raman intensities of the fundamental vibrational modes of the tetrahedral oxoanions SO42-, ClO4-, PO43 and of the plane trigonal oxoanions CO32- and NO3- have been measured from polycrystalline samples. Using the bond polarizability theory, the vibrational eigenvectors of F2(Td) and E' (D3h) species of these anions in different crystalline environments are derived from the above Raman intensity data. The results are consistent with those obtained through Wilson's GF method, although there exists a multiplicity of solutions. Relative values of S—O, Cl—O, P—O and N—O bond polarizability parameters are reported. Comparison of these results with liquid state absolute values from the literature enables us to suggest a standard for measuring absolute Raman intensities in the solid phase.
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    Spectres Raman des Modes Transverses et Longitudinaux à 293 K et 83 K et Spectres de Réflexion Infrarouge à 293 K et 83 K et Spectres de Réflexion Infrarouge à 293 K d'un Monocristal de Phosphite de Lithium, LiH2PO3 (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 5-13 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of oriented single crystals of 7LiH2PO3 and 6LiH2PO3 at 293 K and 83 K are reported and compared. 6Li/7Li substitution was used to identify the translational modes of the lithium atoms. Bands with a lithium isotopic shift of 3-6% are observed in the 300-500 cm-1 region. The spectra of the 6LiH2PO3 single crystal indicate a coupling between the lithium vibrations and the deformation modes δ(PO3) of the HPO2OH- ion. Assignments are proposed for internal modes of the crystal. Polarized infrared reflection spectra at 293 K and longitudinal Raman spectra at 293 K and 83 K in the 400-2500 cm-1 region are reported for 7LiH2PO3 single crystal. An analysis in terms of Drude oscillators leads to a better understanding of the dielectric properties of the monocrystal and also to the determination of the dispersion parameters of the transverse and longitudinal optical modes. The values obtained for the longitudinal frequencies and for the oscillator strengths in Raman scattering and infrared reflection are in good agreement.
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    Etude des Spectres de Diffusion Raman Et d'Absorption Infrarouge des Cyanures de Sodium et de Potassium En Phase II et Phase III (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 115-119 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The infrared and Raman spectra of potassium and sodium cyanides have been recorded in the two orthorhombic phases (Ising spin disordered phase II and ordered phase III). By comparing the intensity of the modes we show that the two crystals have a different behaviour, though they belong to the same space group. In particular, the two librational modes in phase II are accidentally degenerate in KCN (σ ≍ 116 cm-1 at T = 150 K), while they are widely separated in NaCN (σ = 218 cm-1 and 104 cm-1 at T = 250 K). In KCN the second mode seems due to the disorder. Some possible attributions for the translatory motions in phase III are given, based on coupling with the librational motions.
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    Raman spectrum of the ν2 band of H14N3 (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 162-165 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The rotational-vibrational Raman Spectrum of the v2 band of H14N3 has been measured. The results of the analysis of the observed wavenumbers are v0 = 2140.308(4) cm-1, ΔB = -0.00312(1) cm-1 and ΔDj = -7(5)×10-9 cm-1. The Q-branches of the hot band transitions v5→v2+v5 and v6→v2+v6 have been determined to be at 2129.3(1) cm-1.
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    Resonance Raman spectroscopy of heme proteins with intensified vidicon detectors: Studies of low frequency modes and excitation profiles in cytochrome c and hemoglobin (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 166-171 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We have designed and assembled a sensitive vidicon Raman spectrometer which is shown to be well suited for the studies of heme proteins in both Soret (near-ultraviolet) and Q (visible) band regions. This system, employing a dry ice-cooled silicon intensified target (SIT) detector and an additive dispersion double monochromator (two 600 g mm-1 gratings blazed at 400 nm), has excellent stray light rejection and optimum bandpass and resolution (5-12 cm-1) for biological applications. It is demonstrated that a 600 cm-1 wide section of the low frequency Raman spectrum of ferrocytochrome c excited at 413.1 nm (70 mW) can be obtained in 30 ms, which is ˜ 2×104 times faster than that required by the conventional scanning techniques. Our multichannel Raman system has an enhanced detection capability which enables us to identify at least 41 weak Raman lines below 850 cm-1 in the spectrum of ferrocytochrome c. Using the SIT detection system, the Raman excitation profile of a depolarized line at 750 cm-1 in Fe(II) cytochrome c has been constructed and compared with that reported for Ni etioporphyrin. Instead of strong 0-0 Raman intensity, the cytochrome c profile exhibits weaker 0-0 intensity, indicative of the absence of the Jahn-Teller effect. It is further demonstrated that the Soret-excited Raman spectrum of oxyhemoglobin can be readily obtained without photodissociation.
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    Le Spectromètre Raman comme Détecteur Séleitif de la Chromatographie en Phase Liquide (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 193-197 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The purpose of this work is to show that it is possible to use microcells in Raman spectroscopy to detect chemical species in various solvents at low concentrations in order to connect a liquid chromatograph with a Raman spectrometer. Several methods are described in static as well as in dynamic processes.
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    Raman spectra of molten SbCl3/AlCl3 mixtures (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 188-192 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra were obtained for nine molten mixtures of SbCl3 and AlCl3, as well as for the pure components. Also three molten mixtures of AlCl3/NaCl/SbCl3 were studied. Molten AlCl3 contains molecular Al2Cl6(D2h) while molten SbCl3 contains pyramidal (C3v) molecules aligned head to tail. The Raman spectra showed the presence of Al2Cl6 molecules in molten SbCl3/AlCl3 mixtures containing 40 mol% or more AlCl3 but gave no evidence for the formation of SbCl2+ and AlCl4-. However, SbCl3 is structurally modified by the addition of AlCl3 as seen from the shift of the highest Sb—Cl stretching frequency. There is also spectral evidence that points to the formation of polymers that are different from those in pure SbCl3, and it cannot be ruled out that there may be a chloride-deficient antimony species in the AlCl3-rich mixtures. The molecular nature of the observed modifications in these mixtures cannot be deduced solely on the basis of the recorded spectra.
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    The Raman and infrared spectra of the dicyanoiodate (I) ion (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 1-4 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The interaction of iodine cyanide and cyanide in aqueous solution has been reinvestigated and it has been confirmed that a complex cyanide ion, the dicyanoiodate(I) ion [I(CN)2]- is formed. This ion has been isolated in the solid state for the first time, as its tetraphenylarsonium, tetraphenylphosphonium and caesium salts. Infrared and Raman spectroscopic studies of these salts are reported. These spectra are fully consistent with a linear centrosymmetric (D∞h) structure for the [I(CN)2]-ion. Assignments are made for six of the seven fundamentals of the [I(CN)2]-ion in the caesium salt.
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    Calibration of a Raman spectrometer using the Kr+ laser plasma lines (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 62-66 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We show that the plasma lines of a Kr+ laser can be used for the calibration of a Raman spectrometer. We have tabulated the absolute values of the plasma lines as well as the shift of these lines relative to the laser lines.
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    Spectres de Diffusion Raman d'un Monocristal de CBr4 Monoclinique (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 157-161 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polarized Raman spectra of monoclinic CBr4 are interpreted in terms of pseudo-cubic site symmetry 42m. The large polarizability of Br atoms is responsible for the high intensity of the off-diagonal terms of total symmetric tensors. Dipole-dipole coupling gives, for the v3 mode, a quite different behaviour from that of the other internal modes.
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    Orientation des Phases par Etirage dans le Polyéthylène: Etude par Effet Raman (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 176-180 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Research on the polarization of bending vibrations of CH2 makes it possible to deduce the orientation of the different phases of polyethylene. When the sample is stretched, the orthorhombic monocrystalline phase becomes parallel to the stretching axis but the other two phases take a more or less perpendicular direction.
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    Masthead (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980) 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
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    URL: http://dx.doi.org/10.1002/jrs.1250090401
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    Vibrational spectra and structure of cyclopentylamine (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 224-229 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of gaseous, liquid and solid cyclopentylamine and the infrared spectra of the gaseous and solid phases have been recorded. Raman depolarization ratios and infrared band contours in the gas phase indicate that cyclopentylamine exists primarily with a gauche orientation of the  - NH2 group, and the torsional fundamental for this conformer has been observed at 232 cm-1. In the solid state the temperature characteristics in certain spectral regions are consistent with the existence of two low temperature phases, and the higher temperature phase appears to exist over a range of approximately only 7°C. A complete vibrational assignment is proposed, and the structural features of cyclopentylamine are discussed.
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    Vibrational spectra and normal coordinate analysis of CF3OF and CF3OCl (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 230-238 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The IR spectra (1400 cm-1 to 160 cm-1) of the gases at ambient temperature and the Raman spectra (below 1400 cm-1) of the liquids near -196°C are reported for CF3OF and CF3OCl. All fundamentals are assigned under Cs symmetry and the results of a normal coordinate analysis are presented. The assignments of Smardzewski and Fox are adopted with one exception for both CF3OF and CF3OCl: the CF3 rock of A″ symmetry is assigned near 430 cm-1 and the two bands between 200 cm-1 and 300 cm-1 are assigned to an A′ fundamental, involving CF3 rocking and COX bending and a Δν=2 transition in the CF3 torsion. An extra band at 548 cm-1 in the Raman spectrum of liquid CF3 COl near -196°C is assigned to a CF3OCl⃛Cl2 complex. The values of the force constants d(OX) for CF3OX molecules are suggested to be near those for X2O molecules. More than half the normal modes of A′ symmetry show extensive mixing of symmetry coordinates. In some of these cases the symmetry coordinate for which the normal mode is named is the largest but not the dominant contributor to the potential energy distribution, while in others this symmetry coordinate is not even the largest contributor to the potential energy distribution. No normal modes of A′ symmetry are present in which ν(CO), δs(CF3), δ(COX), or δ(CF3) symmetry coordinates are dominant, and the mode conventionally labeled as v(CO) should be labeled as νs(CF3). For the remaining A′ normal modes and all the A″ normal modes, the symmetry coordinate for which the normal mode is named is dominant in the potential energy distribution.
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    Masthead (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980) 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
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    URL: http://dx.doi.org/10.1002/jrs.1250090501
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    Etude par Spectroscopie et Microscopie Raman de Phases Oxyde de Molybdène Déposé sur Alumines (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 291-296 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectroscopy and microscopy have been used to study some catalysts: Mo supported on alumina. Different Mo species were found, depending upon the amount of molybdenum deposited on the carrier. At low coverages (4% wt MoO3) distorted molybdate tetrahedra were observed. Increasing the surface coverage resulted in the formation of a polymolybdate phase with octahedrally surrounded molybdenum. Additionally, ‘bulk MoO3’ appeared when amounts were above 16% wt MoO3. When the supports were washed during their preparation with aqueous NH4OH and HNO3 solutions, preferential formation of polymolybdate phase was observed. In case of washing with alkaline solution ‘free MoO3’ was also detected. Finally using the Raman microprobe MOLE, a map giving the distribution of the different species at the surface of support was obtained.
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    Laser excited Raman spectroscopy of biomolecules. 13 - conformational study of α-chymotrypsin and trypsin (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 304-307 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of bovine pancreatic α-chymotrypsin and trypsin were determined from 7% aqueous solutions and lyophilized solids containing residual sulfate ion. A large amount of β-pleated-sheet structure is present in both molecules, as shown by the contour of the amide III region, but trypsin contains substantially more α-helical conformation than does chymotrypsin. There is evidence of some change in structure of both molecules in solution as compared with the solids. The tyrosines are all or nearly all weakly hydrogen bonded in both enzymes, and the binding of sulfate ion is also weak in the lyophilized solids.
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    Etude de la Dispersion Angulaire des Modes Polaires d'un Monocristal de Phosphite de Lithium LiH2PO3 (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 347-352 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The angular dispersion of polar phonons with wave vectors k(k » (ω/c)) rotating in the planes of symmetry of the orthorhombic LiH2PO3 single crystal has been observed with Raman scattering experiments at T = 293 K in the regions 250-600 cm-1 and 850-1350 cm-1. The agreement of the experimental data with the existing theories of angular dispersion is very satisfying.
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    Masthead (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980) 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
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    Intensities of some vibrational bands in the pre-resonance Raman spectra of quinoxaline, phthalazine and pyridazine (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 214-218 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Experimental studies of the variation of intensity with excitation wavenumber of some a1 vibrational bands in the Stokes Raman spectra of the following molecules are reported: quinoxaline (1,4-diazanaphthalene), phthalazine (2,3-diazanaphthalene) and pyridazine (1,2-diazabenzene). The results are discussed in terms of the Albrecht-Hutley theory of pre-resonance Raman intensities and the electronic states involved in the pre-resonance enhancement identified.
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    Vibrational spectra of C2ν deuterium substituted pyridines. 3For paper 2 in this series see D. P. DiLella and H. D. Stidham, J. Raman Spectrosc. 9, 90 (1980). - pyridine-3,5-d2 and pyridine-3,4,5-d3 (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 239-246 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Pyridine-3,5-d2 and pyridine-3,4,5-d3 have been prepared. Isotopic constitution and label specificity of each of several preparations were verified by mass spectrometry and proton NMR. Liquid phase Raman and both liquid and vapor phase infrared spectra of these molecules are reported. Vibrational assignments consistent with frequency sum and product rule constraints are proposed. The relative rates of base-catalyzed exchange of hydrogen with deuterium for the ring positions of pyridine-N-oxide were estimated during the course of the synthetic work. It is found that the 2 and 6 positions exchange very readily, that the 3 and 5 positions exchange slowly, and that the 4 position exchanges very slowly.
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    Vibrational spectra and bonding in nitrocyclopropane (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 257-262 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra of nitrocyclopropane were recorded from 4000 to 30 cm-1 for the liquid and solid states. Infrared spectra were recorded from 4000 to 180 cm-1 for vapor phase and matrix isolated states. The low frequency torsional mode is located at 101 cm-1 in the liquid state (102 cm-1 in the solid state) and correlates well with the 84 cm-1 value for the vapor phase which is predicted on the basis of a torsional combination band in the infrared vapor phase spectrum. The calculated barrier to internal rotation for the vapor phase is 1645±50 cm-1, 4.70±0.15 kcal mol-1. A vibrational assignment is proposed for the first time and it supports structural arguments that there is significant pseudo-conjugation between the cyclopropane ring orbitals and the substituent NO2 group. Finally, a detailed temperature study reveals no appreciable spectral change; hence, nitrocyclopropane appears to exist as a single Cs conformer over the range -173 to 100°C.
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    Conformational study of methotrexate binding to L. casei dihydrofolate reductase by laser Raman spectroscopy Presented at the 6th International Conference on Raman Spectroscopy, Bangalore, India, 1978, paper Biochemistry II-2. (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 266-272 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: From the Raman spectrum of aqueous L. casei dihydrofolate reductase the protein backbone was found to be predominantly random-coil (∽45%), ∽30% β-sheet and ∽25% α-helical conformations. The Raman spectrum of the binary methotrexate-dihydrofolate reductase complex showed the polypeptide backbone to be predominantly random-coil (∽55%) and β-sheet (∽38%) conformers with a very small percentage of α-helix conformation. A change in the tyrosine doublet intensity (I860/I835) were observed upon binary complex formation. This change in intensity ratio supports a fluctuation in tyrosine hydrogen bonding environment in DHR upon complex formation. In the methotrexate-dihydrofolate reductase complex the pteridine ring of methotrexate was shown to be protonated. Comparison of the Raman spectra of the solution of the native enzyme and binary methotrexate complex supported the hypothesis of significant conformational changes in the L. casei dihydrofolate reductase upon complex formation.
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    Low frequency vibrations (20-400 cm-1) of some mononucleosides in aqueous solution (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 286-290 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Low frequency Raman scattering (20-400 cm-1) of aqueous solutions of uridine, cytidine, guanosine and adenosine are studied by the recently described construction of a quantity R(ν). Bands with intensity maximum at frequencies below 100 cm-1 are assigned to specific protonized forms. An assignment of these bands to nucoleoside modes is preliminarily discussed.
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    Vibrational spectra of mercury(II) dihydrogen phosphate, mercury(II) phosphate and mercury(I) selenate (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 308-311 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman and IR spectra of the crystalline solids Hg2(H2PO4)2, Hg3(PO4)2 and Hg2SeO4 are reported and assigned in terms of vibrational modes of the unit cell. Frequencies v (Hg—O) and v (Hg—Hg) are located in the ranges 210-280 and 180-190 cm-1, respectively. Inter- and intramolecular coupling of Hg—O modes, and of some ligand vibrations, result in splittings of from 5 to 40 cm-1, which can be related to the crystal and molecular structures.
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    On the tautomerism of the thymine anion in the solid state: A Raman and infrared study (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 324-333 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Solid state infrared and Raman spectra of thymine, thymine monohydrate, three types of chloro(thyminato-N1)ethylenediamineplatinum(II) complexes and three types of potassium thyminate (trihydrate, monohydrate, anhydrous compound) are reported and compared. The effects of hydrogen bonding, intermolecular coupling, crystal symmetry and tautomerism are discussed. For the anhydrous potassium thyminate a tautomeric structure, different from that found in the tri- and monohydrate, is postulated.
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    Vibrational spectra and structure of cyclopropyl isothiocyanate (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 334-338 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: For cyclopropyl isothiocyanate, the infrared (4000-200 cm-1) spectra in all three phases and the Raman spectra of the liquid and solid phases have been recorded. From Raman depolarization data and infrared gas phase band contours it has been concluded that cyclopropyl isothiocyanate exists in the cis conformation. No evidence for the existence of other conformations was found in the spectra. An assignment for 24 of the 27 fundamental vibrational modes has been proposed and this assignment has been shown to be in excellent agreement with vibrational assignments for other monosubstituted cyclopropanes and a number of isothiocyanate compounds.
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    Vibrational dephasing in polar molecular liquids: An application to a fundamental and its overtone in phenyl acetylene (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 202-208 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: Based upon the results reported here for phenyl acetylene and the results of other investigators' studies, a working model of phase relaxation in polar molecular liquids is proposed. The model rests upon the established concept of a phase annihilation operator1 and a postulated phase conduction band structure for polar molecular liquids. Three cases are discussed; briefly, they are (I) no effect upon the signal of interest by dilution, (II) narrowing of the signal of interest by dilution, and (III) broadening of the signal of interest by dilution. The latest effect has not been elucidated previously in the literature. Actual examples of each of these cases are discussed. Phenyl acetylene's vcc and 2vcc modes are shown to display Case II behavior. These two modes are found in the Raman spectrum at 2113 cm-1 (vcc) and 4205 cm-1 (2vcc). They have been examined by varying the concentration of this molecule in two dipolar solvents, a quadrupolar solvent and an octopolar solvent. In addition, temperature studies on the neat sample were carried out at 10-30 K intervals for vcc and at 275 K and 90 K for 2vcc. From the results of our investigation, a relaxation mechanism consistent with a quadrupole-quadrupole dephasing type mechanism is postulated for both vcc and 2vcc.
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    The origin of intense Raman spectra from pyridine at silver electrode surfaces: The role of surface carbon (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 273-278 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Intense Raman spectra from pyridine at polished silver electrode surfaces, subjected to a single anodic cycle, appear to be associated with pyridine adsorption in graphitic carbon overlayers on the silver surface. This interpretation is based on the absence of pyridine line enhancement for ‘clean’ (or carbon-free) systems and the simultaneous appearance of intense pyridine and carbon spectra for the systems subjected to a single anodic cycle. Features arising from surface carbon are evident in spectra reported by earlier authors. The evidence for the presence of carbon is based firstly on the conversion of the species in question to hydrocarbons at reducing potentials and secondly on similarities in the spectra of the systems: Ag/0.1 M KCl, Ag/0.1 M KF and Ag/0.1 M KCl, pyridine, in the region of the D and G modes of graphite (1200-1700 cm-1). Similar intensity-potential curves for the pyridine line at 1008 cm-1 and the carbon band at 1595 cm-1 indicate a surface association between these two species. The stability of the pyridine species generating the 1008 cm-1 line on a dry electrode surface favours intercalation (internal adsorption) rather than external physical electrosorption on carbon. The line at 1025 cm-1 is assigned to a silver(I) pyridine complex.
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    Raman spectra and crystal structure of polycrystalline tetramethylammonium salts (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 279-285 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of eight polycrystalline Me4N+ salts have been measured and are discussed in relation to crystal structures. In most of the salts, several degenerate bands of the cation show splittings due to site symmetries lower than Td. From the spectral shapes in the methyl deformation and stretching region and the intensity ratio of the two NC4 skeletal deformation modes, the extent of cation distortion in each particular salt can be deduced. These distortions are strongest in the halides, whereas no significant crystal field effects are found in the SnCl62- and CdCl3- salts. Anion Raman bands and frequencies of lattice modes are also reported.
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    Raman and infrared study of KHSO4 crystal (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 297-303 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: The Raman spectra of the low temperature phase single crystal of KHSO4 and of polycrystalline KDSO4 have been investigated at 300 and 90 K. Infrared spectra of polycrystalline samples have been recorded for compaison in the 4000 to 30 cm-1 range. An assignment of bands due to internal vibrations to their symmetry species (Raman) and in terms of approximate type of motion is given. a distinction between the bands corresponding to cyclic dimers and infinite chains is possible in the case of the OH group and most skeletal stretching vibrations. An interpretation of lattice bands using an oriented gas model is proposed. Hydrogen bonding in the KHSO4 crystal is discussed.
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    Vibrational spectra and conformations of (chloromethyl)cyclopropane and epichlorohydrinPresented in part at the 14th Midwest Regional Meeting of the American Chemical Society, University of Arkansas, Fayetteville, Arkansas, USA, October 26-27 1978, and at the 34th Symposium on Molecular Spectroscopy, Ohio State University, Columbus, Ohio, USA, June 11-15 1979. (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 315-323 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: The IR and Raman spectra (4000-50 cm-1) of (chloromethyl)cyclopropane and epichlorohydrin have been recorded in all three physical states. It has been concluded from the spectroscopic data and from variable temperature studies that (chloromethyl)cyclopropane exists as an equilibrium mixture of gauche (95%) and cis (5%) conformers in the liquid state, while only the gauche form persists in the solid phase. The enthalpy difference between these two rotamers was found to be 1.40±0.10 kcal mol-1. Similarly, epichlorohydrin has also been shown to exist as an equilibrium mixture of gauche-1 (70%), gauche-2 (21%) and cis (9%) conformers in the liquid state, with only the gauche-1 form remaining in the solid phase. Enthalpy differences among these conformers were determined to be 1.2±0.2 kcal mol-1 (gauche-1 vs. cis) and 0.70±0.10 kcal mol-1 (gauche-1 vs gauche-2). Apparently steric repulsions between the chlorine atom and β ring-hydrogens destabilize the cis conformation in each molecule. For each molecule, a vibrational assignment has also been proposed.
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    Redetermination of some of the spectroscopic constants of the electronic ground state of di-Nitrogen 14N2, 14N15N and 15N2 using coherent anti-stokes Raman spectroscopy (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 361-368 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Calibrated coherent anti-Stokes Raman (CARS) spectra have been recorded for the resolved Q branches of the vibrational fundamentals and first hot bands of 14N2, 14N15N and 15N2 at a temperature of 1200 K. The spectra show a convolved linewidth of 0.13 cm-1, and have been used to derive new values of spectroscopic constants, for the species observed, with specific reference to the position of the Q branch lines where J 〉 20 for v = 1-0, and J = 0-30 for v = 2-1. The critical overlap region of the fundamental and the hot band may now be computer simulated with confidence, which should be of considerable help in combustor thermometry using CARS.
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    Solid state vibrational spectroscopy. 9For paper 8 in this series see K. D. Cleaver and J. E. D. Davies, J. Raman. Spectrosc. 9, 376 (1980). - A kinetic study, using Raman spectroscopy, of the solid state thermal decompositions of alkali metal peroxydisulphatesPresented at the Sixth International Conference on Raman Spectroscopy, 4-9 September 1978, Bangalore. India. (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 381-383 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
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    Notes: The kinetic behaviour of the solid state thermal decomposition of peroxydisulphate to pyrosulphate, M2[S2O8] → M2[S2O7], M = Na, K, Rb, Cs, has been studied by following the temporal decrease in the intensity of the Raman band arising from the vs(SO3) mode of [S2O8]2-. The data are best analysed using a conventional kinetic approach rather than the Avrami-Erofeev treatment normally applied to solid state reactions. Although the salts display different kinetic orders, 1.5, 2.0, 1.0 and 1.0 for the Na, K, Rb and Cs salts respectively, the lack of crystallographic data does not allow us to rationalize these differences.
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    Core-size marker resonance Raman bands of metallotetraphenylporphines (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 312-314 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance Raman spectra are reported for Ni(II), Cu(II), Pd(II) and Pt(II) tetraphenylporphine (TPP). Systematic examination of the resonance Raman frequencies of these and of previously reported TPP derivatives has revealed three bands which exhibit a linear correlation with porphyrin core size (Ct-N), near 1460 cm-1 (polarized), 1540 cm-1 (anomalously polarized) and 1570 cm-1 (polarized). Parameters derived from the correlations indicate a reasonable similarity between these TPP modes and those of biological-type metalloporphyrins which also correlate with Ct-N.
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    Masthead (1980)
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    Journal of Raman Spectroscopy 9 (1980) 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
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    Pollutant trapping studies. 1 - Resonance and spontaneous Raman spectra of the decomposition products of nitrogen dioxide on oxide surfaces (1980)
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    Journal of Raman Spectroscopy 9 (1980), S. 33-38 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
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    Notes: The products of the surface decomposition of NO2/N2O4 on zeolites X and A and γ-alumina have been investigated using Raman spectroscopy. On the zeolite surfaces results indicate that a self-ionization surface reaction occurs to generate nitrate (NO3-) and nitrosonium (NO+) ions. The extent of self-ionization of NO2/N2O4 appears to be far greater for the zeolitic absorbed phase than for the liquid phase. The nitrate appears to be held on cation sites while the nitrosonium ion is associated with the zeolitic oxide framework. Two different nitrate species form on zeolite A while only one nitrate species was detected on zeolite X. In the zeolite systems the spectra of adsorbed NO+ were resonance enhanced using shorter wavelength exciting lines while the nitrate spectra were conventional (spontaneous) Raman spectra. On γ-alumina the products of the surface decomposition of NO2/N2O4 consist of three distinct types of surface nitrate with NO+ not being detected.
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    Vibrational spectra of C2v deuterium substituted pyridines. 2For paper 1 in this series, see H. D. Stidham and D. P. DiLella, J. Raman Spectrosc. 8, 180-184 (1979). - Pyridine, pyridine-4-d, pyridine-2,6-d2 and pyridine-2,4,6-d3 (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 90-106 
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    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Pyridine-4-d, pyridine-2,6-d2 and pyridine 2,4,6-d3 have been prepared. The isotopic composition and label specificity of each of several preparations were verified by mass spectroscopy and proton NMR. The liquid phase Raman and the liquid and vapor phase infrared spectra are reported for these materials and for pyridine at room temperature. A new vibrational assignment consistent with frequency sum and product rule constraints is proposed. Thermodynamic functions calculated from the pyridine assignment are found to be in good agreement with published experimental values.
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    Vibrational spectra and conformations of vinyloxirane (1980)
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    Journal of Raman Spectroscopy 9 (1980), S. 120-124 
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    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The infrared spectra of gaseous and solid vinyloxirane have been recorded, while Raman spectra of all three physical states have been obtained. The vibrational data for the liquid and vapor phases are consistent with the presence of three conformations, the s-trans and two nonequivalent gauche forms. The energy separations between the most stable s-trans and each of the other confromers have been determined for the liquid state to be 1.1 ± 0.2 and 0.8 ± 0.2 kcal mol-1 by measuring the temperature dependence of sets of Raman lines. A complete vibrational assignment is proposed for the s-trans conformer, and the identities of the less stable conformers are discussed in terms of previous studies of related molecules.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250090210
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  • 97
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    On the fermi resonance observed in molecules undergoing a large amplitude vibration (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 137-138 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: By using a simple model of a molecule undergoing a large amplitude vibration (LAV), it is shown that the Fermi resonance observed in such a class of molecules exhibits a temperature dependence.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250090214
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  • 98
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    Carbon-hydrogen stretching and bending vibrations in the Raman spectra of poly (methylmethacrylate) (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 150-154 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of three deuferated poly(methylmethacrylate) derivatives,  - (CH2C(CD3)COOCD3)n,  - (CD2C(CH3)COOCD3)n and  - (CD2C(CD3)COOCH3)n, are measured and the assignment of the C—H stretching and bending vibrations of the methylene, α-methyl and ester methyl groups of PMMA is made.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250090304
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  • 99
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    Raman spectroscopic study of glassy aqueous zinc halide solutions (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 85-89 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra of aqueous zinc halide solutions are obtained in both liquid and glassy states. It is shown that the detection and characterization of weak low frequency Raman bands in aqueous solutions is much easier in the Raman spectrum for the glassy state than for the liquid state. Comparison of the spectra shows that the tetrahedral ZnX42- ions are the most stable ionic entities in the glassy state.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250090206
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  • 100
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    Resonance Raman spectra of D and 15N isotopes of methyl orange in aqueous solutions (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 9 (1980), S. 198-201 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Resonance Raman spectra of methyl orange and its ring-deuterated and azo-15N-substituted derivatives have been recorded in neutral aqueous solution and in solutions in 0.1 M hydrochloric and deuteriochloric acids. Band assignments have been given by referring to the isotope shifts, and on that basis the structures of the base and the acid forms of the dye molecule in the lowest electronic excited state are discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250090314
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