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 9, Issue 18
Displaying 1-10 of 10 articles from this issue
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  • Microanalysis of Cosmogenic Nuclides in Iron Meteorites
    Teruo Hayakawa
    1961 Volume 9 Issue 18 Pages 67-86
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.67
    JOURNAL FREE ACCESS
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  • Mass Spectrum of Residual Gases in High Vacuum Observed with a High Resolving Power Mass Spectrometer
    Jun Okano
    1961 Volume 9 Issue 18 Pages 87-95
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.87
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    Resolving power of the mass spectrometer (constructed for micro-analysis in Osaka University) was increased up to about700 and the mass spectra of residual gases at the pressure of 2. 5× 10-8 mmHg were observed in the mass range from 12 to 46. Numbers of doublets or multiplets were found in the mass spectra and each peak was assigned to an appropriate ionic specy considering its mass and peak height.
    It was found that oxygenated hydrocarbons and chlorine or hydrochloric acid were existent. The peak shapes of CH4+, C+ and H+ were somewhat different from others, which may due to the excess of the initial energies. Owing to the increased resolving power, it became possible to separate rare gas peaks from hydrocarbon peaks under dynamic or static operation, which was useful for the micro-analysis of rare gases.
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  • Ultra High Vacuum Mass Spectrometer II.
    Behavior of Getter Ion Pump and Ionization Gauge under Static Operations
    Masayuki Gotoh
    1961 Volume 9 Issue 18 Pages 95-102
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.95
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    The results of the preliminary work on the ultra-high vacuum mass spectrometer were discribed in the previous paper. After that, several reforms have been made in order to improve the end vacuum and the sensitivity of the mass spectrometer. The pressure of the order of 10-9 mmHg was attained and the ion current of the order of 10-18 A could be measured. Concerning with pumping action of the ion pump and the ionization gauge, variations of the residual peak heights with time were investigated in the closed vacuum system. From the results of the analyses of residual gases at the end vacuum, N2, CO, Ar, CH4, CO2, H2O and hydrocarbons(C1-C4 groups)were observed.
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  • On the Defect of Peak Shape in Mass Spectrum
    Nozomu Morito, Hitoshi Tsuyama
    1961 Volume 9 Issue 18 Pages 102-104
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.102
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    This paper describes the calculation of the deformed peak shape in mass spectrum. Sometimes the top of the peak in mass spectrum is inclined and a swelling appears on the skirt of the peak. Assuming that a main ion beam accompanied with a weak beam enters into an ion collector, the deformed peak shape can be expected from calculation.
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  • Chemical Analysis by Means of Mattauch-Herzog Type Double Focusing Mass Spectrograph III.
    Measurements of Isotopic Abundance Ratios for the Study of Quantitative Analysis
    Kumasaburo Kodera, Tutomu Makita, Junjiro Kai, Shoji Fukuda, Hiroyuki ...
    1961 Volume 9 Issue 18 Pages 105-109
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.105
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    Three different methods have been examined to express the densities of spectrograms recorded on an Ilford Q2plate in our Mattauch-Herzog type mass spectrograph. The exposures have been decided by the integrated ion currents measured by the monitor electrode, thus their fluctuations have been eliminated without any internal standard. As examples, the isotopic abundances of Cu and Zn have been measured with appropriate calibration curves . The precision and accuracy of the measurements have been briefly discussed.
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  • Mass Spectrometric Study on the Structures and the Degradation Reactions of High Polymers. I. Preliminary Investigation on the Volatile Components in Commercial Polyethylene by Utilizing the Ion Source for Gas Alnaysis
    Kisaku Nakagawa
    1961 Volume 9 Issue 18 Pages 110-119
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.110
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    Lots of ions were observed in the spectra of polyethylene heated in the ion source of a mass spectrometer for the temperature range of 150-330°C. With elevation of temperature, the rate of ionic yield displayed a stage of slower increase(Process I), followed by a steeper uprise(Process II). For two brands of commercial polyethylene, Marlex and Hostalen, it was found that the values of activation energy for the latter stage appeared to be 34.0kcal/mol for Marlex and 24. 7kcal/mol for Hostalen. On the other side, the values for Process I were found to be 6. 5± 1.2kcal/mol for both samples. According to the mass spectra and the values of activation energy, it was concluded that Process II is corresponding to the stage of thermal degradation, which is presumed to be caused by some of the weak-links in the polymer molecule, while Process I would be explained by the presence of a stage of evaporation of lighter components contained originally in polyethylene. Thus the possibility of analyzing the structure of high polymers is suggested by regarding these volatile components as a miniature model of polymers.
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  • Anomalous Behavior of Water Vapor in Mass Spectrometry
    Noriaki Kadota, Seiichi Ishida
    1961 Volume 9 Issue 18 Pages 119-122
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.119
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    It is well known that the rate of effusion of particles in gaseous or vapor phase appears inversely proportional to the mass of the particles under the condition where the effusive flow can be undertaken. The effusive behavior, therefore, may be utilised for the explanation of mass spectra attributing a peak of certain mass number to be originated from the particle of known molecular weight. The authors studied the effusive behavior of water vapor comparing with some standard gaseous and vapor phase samples such as Ar, CO2, C2H5OH, using a mass spectrometer specially arranged to be available for the present purpose, and found that water vapor statically evaporated should behave as it is consisted of the double molecule of H2O in the process of flow through the so-called “ gas leak ” hole. This conclusion is supported by the discrepancy between the mass spectrometrically measured ionization potential and the spectroscopic data.
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  • RECENT RESEARCHES
    [in Japanese]
    1961 Volume 9 Issue 18 Pages 123-125
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.123
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  • [title in Japanese]
    [in Japanese]
    1961 Volume 9 Issue 18 Pages 125-130
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.125
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1961 Volume 9 Issue 18 Pages 131-134
    Published: October 31, 1961
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.9.131
    JOURNAL FREE ACCESS
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