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  • Analytical Chemistry and Spectroscopy  (14)
  • ASTROPHYSICS  (8)
  • 1990-1994  (22)
  • 1
    Electronic Resource
    Electronic Resource
    Peptide sequencing by partial acid hydrolysis and high resolution plasma desorption mass spectrometry (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 906-912 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A method of deriving peptide sequence information using partial acid hydrolysis in combination with accurate mass measurements and immonium ion analysis provided by high-resolution plasma desorption mass spectrometry has been developed. The technique is very simple in terms of the chemistry and involves a short-time (3-30 min) incubation of the peptide in 1N-6N HCl at 100-110°C with subsequent mass spectrometric analysis. Partial acid hydrolysis is found to produce sequence-specific segments, often ladder-like, although not always a complete set. Two application examples of the method are given: the linear peptide bradykinin and desmopressin, a peptide with an internal S—S bond and a non-amino-acid constituent. The technique has proved to be particularly useful in cases where some a priori information on the peptide structure was already known or where the automated Edman degradation technique might yield erratic results or not work at all.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290081109
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  • 2
    Electronic Resource
    Electronic Resource
    Formulation of a universal electron probe microanalysis correction method (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 21 (1992), S. 27-35 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new correction method for obtaining quantitative electron probe microanalysis results is described. It utilizes data provided by Monte Carlo simulations and tracer measurements to obtain a detailed picture of the way in which the x-ray emission process is influenced by the relevant experimental parameters. Then empirical equations are derived which model the intensity of x-ray emission for an extremely wide range of experimental conditions, encompassing electron beam energies from 5 to 40 keV, characteristic x-ray wavelengths from 11.4 to 0.08 nm, angles of electron incidence from 90° to 40° and elements ranging from beryllium to uranium in the Periodic Table. The method treats separately, as with the traditional approach, the effects of atomic number difference in specimen and standard, x-ray absorption and x-ray fluorescence. The correction method was tested on an extensive range of microanalysis data and shown to work well under all conditions, providing chemical compositions which are accutate to within a few percent relative. The capability of handling ultra-light element (beryllium to sodium) analysis is particularly impressive and the r.m.s. error of 3.8% for carbon analysis on carbides is very close to the errors incurred in measuring actual x-ray intensities. The correction program is currently being developed for commercial use on IBM-compatible computers and the final stage in the evolution of the universal correction will be to extend it to deal with the analysis of thin surface films.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300210109
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  • 3
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    Spectroscopy of Z Camelopardalis in outburst with the Hopkins Ultraviolet Telescope (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Hopkins Ultraviolet Telescope on board the Astro-1 shuttle mission was used to observe the 830-1850 A spectrum of the cataclysmic variable Z Camelopardalis near the peak of a normal outburst. The observation reveals a rich absorption-line and continuum spectrum which peaks near 1050 A at a flux of 5 x 10 exp -12 ergs/sq cm/s/A. In the sub-Ly-alpha region, some of the stronger absorption lines are given. No emission is observed below the Lyman limit. The continuum spectrum resembles that of an optically thick accretion disk where the integrated spectrum is constructed by summing stellar model atmospheres. Similar models using summed blackbody spectra fail to approximate the observed continuum.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 381; L25-L29
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The solar wind interaction with Comet P/Grigg-Skjellerup (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The Giotto spacecraft is scheduled to intercept Comet P/Grigg-Skjellerup on July 10, 1992. The observed outgassing rate of this comet is over an order of magnitude smaller than Comet Giacobini-Zinner and over two orders of magnitude smaller than that of Comet Halley. Consequently, the new data obtained during the upcoming encounter will strengthen our understanding of how the solar wind interaction with comets depends upon the neutral gas production rate. In this brief note, we make predictions of the location of the flow transition regions - i.e., the bow shock and the ionopause, and discuss the expected level of wave turbulence.
    Keywords: ASTROPHYSICS
    Type: Earth, Moon, and Planets (ISSN 0167-9295); 60; 1; p. 31-40.
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Far-ultraviolet observations of the supernova remnant N49 using the Hopkins Ultraviolet Telescope (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Hopkins Ultraviolet Telescope has been used to obtain the first sub-Lyman-alpha spectrum of an extragalactic SNR, N49, in the LMC. Emission from O VI 1032, 1038 has been detected in this spectral region. The measured fluxes of C IV, semiforbidden O IV, and O VI and the upper limit on N V provide stringent limits on the shocks responsible for the bulk of the O VI production. O VI cannot originate in the shocks with velocities of 140 km/s or less because the postshock temperature is not high enough. The nonradiative main blast wave cannot account for the brightness of the observed O VI emission. The majority of the O VI must originate in an optically faint system of shocks with velocities of 190-270 km/s and preshock densities of 20-40 cu cm. The emission from such high-velocity shocks is dominated by O VI.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 401; 1; p. 220-225.
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Lower hybrid turbulence at cometary bow wave and acceleration of cometary protons (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The wave measurements at the spacecraft encounters with Comet Halley have shown intense wave activity at the lower hybrid frequency. The excitation of the lower hybrid instability by the pickup cometary ions (protons and water group) in the bow wave region and the quasi-linear diffusion of the ions in these fluctuations are discussed. The quasi-linear diffusion of the pickup protons takes place over a scale length shorter than that of the heavier water group ions. This enhances damping of the waves by protons, and when the pickup proton density is large enough, it can result in the saturation of the instability as this damping balances the heavy ion driven growth. The observed electric field amplitude and the scale length of proton relaxation are in agreement with the theory. For small pickup proton density the instability can saturate due to the wave energy cascade arising from the modulation instability of the large-amplitude lower hybrid waves. This saturation mechanism leads to electron acceleration and suprathermal tail formation.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A2; p. 1325-1331.
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
    Electronic Resource
    Electronic Resource
    Novel aryloxy migrations in substituted diphenyldithiocarbonates under electron impact conditions (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 459-462 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unusual expulsion of ‘SO’ was observed from the molecular ions of substituted diphenyldithiocarbonates under electron impact conditions. An initial aryloxy migration to sulphur followed by further rearrangement is proposed for this process, based on the substituent effects. The diarylthioketone radical-cation structure assigned for the [M - SO] ion was confirmed through the collision-activated dissociation B/E linked-scan spectra.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210280433
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  • 8
    Electronic Resource
    Electronic Resource
    Measurements of L1, Lα, Lβ and Lγ x-ray fluorescence cross-sections in heavy elements excited by 36.62, 43.69, 48.30, 50.20 and 53.50 keV photons (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 22 (1993), S. 401-405 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: L1, Lα, Lβ and Lγ x-ray fluorescence cross-sections were measured in Au and Pb at excitation energies of 36.62, 43.69, 48.30, 50.20 and 53.50 keV. Measurements were made using an x-ray tube with a secondary exciter system as the excitation source. The x-ray tube with a secondary target arrangement was used to obtain high intensity with a high degree of monochromatization. By using an x-ray tube it is possible to measure L x-ray fluorescence cross-sections even for low-intensity x-rays (L1). The experimental results were compared with the theoretically calculated values of L x-ray fluorescence cross-sections and a fairly good correspondence was observed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300220606
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  • 9
    Electronic Resource
    Electronic Resource
    Photon-excited K x-ray fluorescence cross-sections for some light elements in the energy range 20-60 keV (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 22 (1993), S. 406-409 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Kα and Kβ x-ray fluorescence cross-sections were experimentally determined for elements in the range 26 ≤ Z ≤ 40 at various excitation energies using and x-ray tube with a secondary exciter system as the excitation source. The x-ray tube with a secondary target arrangement was used to obtain high intensity with a high degree of monochromatization. Experimental values were compared with the theoretical values calculated using IKβ/IKα ratios based on Hartree - Fock and Hartree - Slater theories. The experimental values for all the elements at various excitation energies were in good agreement with the theoretical values.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300220607
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  • 10
    Electronic Resource
    Electronic Resource
    Competing oxygen transfers from nitro group to sulphur and allenic double bonds in allenyl o-nitrophenyl sulphides on electron impactDedicated to Professor Hans-Fr. Grützmacher on the occasion of his 60th birthday. (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 515-518 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Interesting oxygen transfers from the o-nitro group to allenic carbons were observed in allenyl o-nitrophenyl sulphides under electron impact conditions giving rise to abundant fragment ions at m/z 151, 138 and 136. However, a similar oxygen transfer to the sulphur leads to another intense ion at m/z 145. The proposed fragmentation pathways and the ion structures were established through high-resolution data, collision-activated dissociation mass-analysed ion kinetic energy and B/E linked-scan spectra.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210270425
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