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  • Analytical Chemistry and Spectroscopy  (3)
  • Wiley-Blackwell  (3)
  • American Association for the Advancement of Science
  • American Geophysical Union
  • Oxford University Press
  • 1980-1984  (3)
  • 1965-1969
  • 1935-1939
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  • Wiley-Blackwell  (3)
  • American Association for the Advancement of Science
  • American Geophysical Union
  • Oxford University Press
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Application of the MS80 and a new high resolution selected ion monitoring routine to the determination of trace levels of TCDD (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1980), S. 597-599 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The MS80 is a high resolution mass spectrometer of exceptional sensitivity because of new design concepts in ion source technology. The use of hexapoles enables this high sensitivity specification to be maintained throughout the resolution range. This is of prime importance in selected ion monitoring at high resolution. The power of selected ion monitoring as a technique for the detection and estimation of trace compounds in complex samples is greatly increased by the use of new software for the DS55 data system which introduces considerable flexibility in data processing. The data is recorded using a computer controlled sweep superimposed on peak switching. The user may then choose to integrate the data over any portion of the recorded mass range to eliminate interfering materials and also to average over any time interval to improve signal-to-noise ratio. Peak profiles are continuously displayed during acquisition as a guide to the progress of an experiment and available on recall for post-run processing. The use of the MS80 with this new software is exemplified by the detection of TCDD at trace levels in the presence of other chlorinated materials.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200071130
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray production in thin films by electrons with energies between 40 and 100 keV. 1 - Bremsstrahlung cross-sections (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 12 (1983), S. 153-162 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Cross-sections for bremsstrahlung production in thin films may be derived theoretically only if certain approximations are made or if there is recourse to numerical techniques. In this paper, two approximate equations, one based on the Sommerfeld theory and the other on the Bethe-Heitler theory, are assessed for their accuracy in predicting cross-sections differential in photon energy and emergence angle when a thin foil target is bombarded with electrons with energies between 40 and 100 keV. Experimental data are presented from eight different target materials and these are processed initially to make comparisons between experimental and theoretical spectral shapes and subsequently to compare observed and predicted absolute cross-section values. Except for the heaviest target material (Au), the Bethe-Heitler theory provided a satisfactory description of all experimental observations. In contrast, the Sommerfeld theory provided a significantly inferior description of spectral shapes and consistently overestimated absolute cross-sections by 15-20%.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300120407
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray production in thin films by electrons with energies between 40 and 100 keV. 2For Part l. see p. 153. - Characteristic cross-sections and the overall x-ray spectrum (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 12 (1983), S. 163-169 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Two approximate theories are considered for the production of characteristic x-rays when thin foil targets are bombarded with electrons with energies between 40 and 100 keV. One, due to Kolbenstvedt, is semi-classical in nature whilst the other, due to Bethe, contains two parameters which are normally adjusted empirically. Data from six different target materials are presented, but because errors in experimentally derived absolute cross-sections are large, a comparison is made between theoretical and observed ratios of characteristic Kα photons to bremsstrahlung photons in a 20 eV channel directly beneath the peak. By adjusting the Bethe parameters and using a modified Bethe-Heitler theory to predict the bremsstrahlung, agreement between experiment and theory of typically 10% is recorded. Finally, a means of simplifying the equations used to enable rapid calculation of x-ray spectra with a pocket calculator is indicated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300120408
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