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  • 1
    Electronic Resource
    Electronic Resource
    Surface analysis by sputtered neutral mass spectrometry with electron-beam-excited plasma (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 595-597 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new type of sputtered neutral mass spectrometer, named SNART (Sputtered Neutral Analysis - Riken Type), was evaluated. SNART uses an argon plasma that is driven by an electron beam. The plasma is used for both sputtering of the sample and post-ionizing the sputtered neutral atoms. A depth profile of multilayered Ge/Si was taken by SNART to evaluate depth resolution. The quantitativeness of SNART was also checked using a stainless-steel sample. The results were compared with those by conventional SIMS and glow discharge optical emission spectrometry. The following features of SNART were confirmed: (1) high post-ionization efficiency; (2) high depth resolution; (3) high sputtering rate; (4) no matrix effect on post-ionization efficiency; and (5) high quantitativeness.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740141006
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies in organic mass spectrometry - V:For Part IV, see ref. 3. N-arylsulphonyliminopyridinium betaines (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1383-1390 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentation of N-arylsulphonyliminopyridinium betaines has been rationalized using high resolution mass spectrometry as well as deuterium labelling. The most characteristic features are a very facile N—S bond cleavage and skeletal rearrangements accompanied by the expulsion of SO2 from the molecular ion and the [M—1] ion to the corresponding ionized N-aryliminopyridinium betaines and azacarbazoles, respectively. The presence of methyl substituents at the α-position of the pyridine ring has a significant effect on the mode of the fragmentation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210051205
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    Paper (German National Licenses)
    Fulltext
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