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  • Analytical Chemistry and Spectroscopy  (87)
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE  (44)
  • INSTRUMENTATION AND PHOTOGRAPHY  (44)
  • 1975-1979  (175)
  • 1978  (175)
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  • 1975-1979  (175)
Year
  • 1
    Publication Date: 2019-06-27
    Description: A simple technique for single-scan T1 measurements in solids is proposed and analyzed for single exponential spin-lattice relaxation. In this technique, the direct spin heating caused by the sampling process is significantly reduced in comparison with conventional techniques by utilizing the 'solid echo' to refocus the magnetization. The applicability of this technique to both the solid and liquid phases is demonstrated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 49; Aug. 197
    Format: text
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  • 2
    Publication Date: 2019-07-13
    Description: The laser-induced fluorescence technique for obtaining direct measurements of atmospheric OH and other gases is described. A narrow-band UV laser is tuned to one or more of the electronic absorption bands of a specified molecule so as to cause fluorescence from a bonding excited electronic state. The monitored wavelength is longer than the laser wavelength. Equipment, specifics for OH detection, data processing, and interference are discussed, and application of the technique to the detection of NO, SO2, and CH2O is considered.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Symposium on Meteorological Observations and Instrumentation; Apr 10, 1978 - Apr 14, 1978; Denver, CO
    Format: text
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 1 (1978), S. 306-307 
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; calculation of sample size ; simplest formula ; any type of GC column used ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 361-365 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The method of indirectly heating the emitter wire with a laser is introduced into field desorption mass spectrometry. Use of this method results in improved sensitivity, more reliable high resolution performance, and extension of field desorption mass spectrometry to the area of high temperature chemistry.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 344-349 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Methyl and acetyl substituent effects on 13C chemical shift have been determined on (α 1→3), (α 1→4), (β 1→3) and (β 1→4) linked polysaccharides such as pseudo-nigerane, β-cyclodextrine, amylose, laminarane and cellulose. Methyl α- and β-D-glucopyranoside have been used as monomer model compounds. Shift determination of hydroxylated and substituted polysaccharides requires unambiguous assignment of their 13C spectra. Selective heteronuclear spin decoupling and the isotope effect of deuterated hydroxyl have been used as assignment techniques.
    Notes: L'influence des substituants méthyle et acétate sur le déplacement chimique 13C a été déterminée sur les polysaccharides liés par liaison glycosidique (α1→3), (α1→4), (β1→3) et (β1→4) suivants: pseudonigérane, β-cyclodextrine, amylose, laminarane et cellulose. Nous avons utilisé les méthyl α et β glucopyranosides comme composés modès. La détermination de l'effet des substituants sur le déplacement chimique 13C nécessite l'attribution non ambiguë des spectres 13C des polysaccharides hydroxylés et substitués. On a utilisé pour cela la technique d'irradiation sélective hétéronucléaire et l'effet isotopique d'hydroxyle deutérié.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 431-437 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of bicyclic ketones bicyclo[4.2.1]nonan-9-one, bicyclo[5.2.1]decan-10-one, bicyclo[4.3.1]decan-10-one and bicyclo[5.3.1]undecan-11-one specifically deuterated in positions both adjacent and nonadjacent to the carbonyl carbon have been investigated. The fragmentation and rearrangement processes predominating appear to be dictated by the inherent strain in the molecules. An unusual tendency for fragment ions to recyclize is supported by deuterium labeling results, high resolution mass measurements, metastable studies and comparison with model compounds. The mass spectra of the bicyclic ketones under investigation are considerably more complex than those of acyclic ketones.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 7 (1978), S. 206-211 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Mathermatical techniques (Fourier transform and iterative procedures) are described for unfolding spectrometer broadening from observed X-ray emission peaks. This enables enhanced resolution to be obtained. Broadening introduced by soller collimators and by crystal imperfections are considered in detail. Low energy peak ‘tailing’ due to beam divergence in the plane of the soller slits is also discussed.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 232-237 
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A specific portion of our environment has been contaminated with Kepone, or chlordecone. Additionally, some specific human exposures to high concentrations of Kepone have been confirmed. Gas chromatography mass spectrometry involving chemical ionization and high resolution mass spectrometry were used to detect, identify and confirm the presence of Kepone, Kepone photoproducts and a reduction product of Kepone in environmental and human samples. Field desorption, field ionization and electron impact mass spectrometric methods, as well as infrared and nuclear magnetic resonance techniques were used to characterize and identify Kepone hydrate and hemiketal in benzene and methanol solutions, respectively.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 29-31 
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simplified technique of collecting breath CO2 for isotopic analysis has been developed. The subject breathes into a 3 I bag from which a 50 ml aliquot is transferred to an evacuated, septum-capped tube (Vacutainer®). The sample is later withdrawn and the CO2 is cryogenically purified. No isotope fractionation is observed in samples collected in this manner. Samples have been stored up to three months without any change in the isotope ratio.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 76-79 
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several substituted 8-aminoquinolines related to known antimalarial drugs have been studied by gas chromatography mass spectrometry. 5,6-Dihydroxy-8-aminoquinoline, a possible metabolite of Primaquine, can be detected by single ion monitoring after conversion to a trimethylsilyl ether derivative. The mass spectra obtained in this study indicate that there are certain ions which are characteristic of the trimethylsilyl ethers of hydroxylated 8-aminoquinolines and 5,6-dimethoxy-8-aminoquinolines. These compounds should thus be amenable to analysis if they were produced during in vivo metabolism studies. Using selected ion monitoring the derivatized compounds can be detected at submicrogram levels.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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