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 36, Issue 5
Displaying 1-5 of 5 articles from this issue
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  • Isotopic Abundances of Germanium Determined by Secondary Ion Mass Spectrometry
    Hiroshi Nishimura, Hideo Takeshi, Jun Okano
    1988 Volume 36 Issue 5 Pages 197-202
    Published: 1988
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.36.197
    JOURNAL FREE ACCESS
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    Isotopic abundances of germanium were determined by secondary ion mass spectrometry. A pellet of 99.999% pure germanium was used as a sample. It was bombarded by 12 keV oxygen primary ion beam whose diameter and current were 70-100 μm and 1-5×10-7 A on the sample surface. The isotopic ratios obtained are 70Ge/74Ge=0.58303±0.00033, 72Ge/74Ge=0.76341±0.00028, 73Ge/74Ge=0.21458±0.00013 and 76Ge/74Ge=0.20771±0.00011. The isotopic abundances determined are 70Ge: 21.058±0.012, 72Ge: 27.573±0.011, 73Ge: 7.750±0.005, 74Ge: 36.118±0.006, and 76Ge: 7.502±0.004 in percent.
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  • Mass Spectrometric Measurement of Distribution of Ventilation-Perfusion Ratio in Lung by using the Concept of Multiple Compartment Transfer Function
    Kezheng Gan, Isao Nishi, Hiroshi Fukuzawa
    1988 Volume 36 Issue 5 Pages 203-214
    Published: 1988
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.36.203
    JOURNAL FREE ACCESS
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    Distribution of ventilation-perfusion ratio (VA/QC distribution) is one of the most important functional parameters of the lung. A new method for noninvasive measurement of VA/QC distribution is described. Based on a multiple compartment model which simulates the lung as an electric RC network, a concept of multiple compartment transfer function (MCTF) is proposed. A system of algebraic equations is derived from MCTF and the VAZQC distribution can be obtained by solving these equations according to the frequency response of the lung which is measured by continuous analysis of respiratory gas during the inspiration of the gas with sinusoidally varied halothane concentration.
    Simultaneous and instantaneous analysis of physiological and inert gases is essential in this measurement. By employing an improved multicollector mass spectrometer, such measurement was accomplished with comparatively satisfactory sensitivity and stability. Another technical problem was to produce the air flow containing sinusoidally varied halothane concentration with a wider range of frequency components. It was achieved by using a commercially available flow controller combining with computer-controlled frequency modulation and synthesis technique.
    Experimental results of normal subjects and patients with lung diseases gave physiologically reasonable results of VA/QC distributions. It is demonstrated that the method is useful in physiological studies and clinical diagnoses.
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  • Rearrangements in Carbocation Chemistry in the Gas Phase
    Sun Zhuolian, Dong Zhenwen, Cao Zhongmin
    1988 Volume 36 Issue 5 Pages 215-220
    Published: 1988
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.36.215
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    Rearrangements in cyclic and acyclic carbenium ions through hydride and methide shifts in the gas phase were investigated by MS/MS and ion neutralization/radical trapping/CAD techniques. Results indicate that: (i) there is no hydride shift on a saturated cyclohexane ring; (ii) when there is a double bond on the ring, hydride shift will take place, resulting in the formation of a more stable allylic type cation; (iii) in an acyclic hydrocarbon carbenium ion of neopentyl type, methide shift of a Wagner-Meerwein rearrangement takes place just as in solution.
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  • Mass Spectrometry of 1-Azabicyclo[3.3.1]nonan-4-ols
    Hidetoshi Fujiwara, Masahisa Inoue, Akira Kato
    1988 Volume 36 Issue 5 Pages 221-228
    Published: 1988
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.36.221
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    The fragmentations of 1-azabicyclo [3.3.1]nonan-4-ols in electron ionization are discussed. The mass spectra of these compounds containing a hydroxyl and an alkyl groups at the 4 position revealed characteristic peaks at [M-17]+, m/z 182, m/z 168, m/z 154, m/z 140, m/z 112, m/z 97, m/z 96, m/z 84, m/z 82, m/z 70, and m/z 69. The compositions of the peaks were determined by a high resolution mass spectrometry. The fragmentation mechanisms for giving these peaks were based on observations of the corresponding to metastable peaks. In particular, the compounds contaning an alkyl substituent produce characteristic ions at m/z 182, m/z 168, and m/z 154 which resulted from loss of part of the alkyl group from the molecular ion.
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