Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 41, Issue 5
Displaying 1-3 of 3 articles from this issue
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REVIEW
  • Studies on Photoionization Process in Atomic Vapor Laser Isotope Separation Applied to Heavy Elements at JAERI
    Takashi ARISAWA, Ikuo WAKAIDA, Katsuaki AKAOKA, Masabumi MIYABE, Masak ...
    1993 Volume 41 Issue 5 Pages 253-276
    Published: 1993
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.41.253
    JOURNAL FREE ACCESS
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    Multistep photoionization process is discussed concerning the Atomic Vapor Laser Isotope Separation applied to isotopes of heavy elements which has been carried out at Japan Atomic Energy Research Institute these 6 years. We present the studies related to the collection of basic spectroscopic data, selection of the most effective stepwise ionization, photodynamical characterization, excitation of hyperfine structure and laser beam propagation in absorbing medium. Techniques to determine the optical properties using stepwise photoionization, optimization techniques to find the most effective combination of laser wavelengths are also presented.
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REGULAR PAPERS
  • Fragmentation of Alkyldisilane Ions in EIMS I. 1,1,2,2-Tetramethyldisilane
    Masao YAMAMOTO, Motoko TANAKA, Yoshiko YOKOTA, Takae TAKEUCHI
    1993 Volume 41 Issue 5 Pages 277-286
    Published: 1993
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.41.277
    JOURNAL FREE ACCESS
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    The fragmentation of 1,1,2,2-tetramethyldisilane by using a deuterium labeling technique, a B/E linked scanning technique and ab initio MO methods was studied. In 70eV-EIMS the base peak was observed at m/z 59, which is produced by the simple cleavage of an Si-Si bond. It was confirmed by the ab initio MO calculation that the formation of this ion might occur predominantly. It was concluded that the abundant ion at m/z 73 was produced by a 1,2-hydrogen shift from one silicon atom to the other with simultaneous reverse shift of a methyl group.
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  • Evaporation of Charged Droplets in Atmospheric Pressure Spray Mass Spectrometry
    Atsumu HIRABAYASHI, Minoru SAKAIRI, Yasuaki TAKADA
    1993 Volume 41 Issue 5 Pages 287-294
    Published: 1993
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.41.287
    JOURNAL FREE ACCESS
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    Ions produced in atmospheric pressure spray (APS) ionization from aqueous solutions of sucrose and alanine are detected with a quadrupole mass spectrometer. The S/N ratios for their mass spectra are analyzed to study the evaporation of charged droplets, since they are detected as random noises. Two kinds of heated sampling orifices with thicknesses of 0.5 and 12.5 mm are compared. Higher ratios are obtained with the thicker one. The solution concentration dependence of the relative intensity of the cationized sucrose molecule suggests that ion evaporation does not take place in the sampling orifice and that the charged droplets produced by adiabatic expansion are suppressed by heating the vaporized solution. At the optimized pressures in the intermediate-pressure regions, 65 fmol of sucrose is detected. However, the noise level is still determined by detecting charged droplets, which are likely to be produced by the spray in the atmospheric-pressure region.
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