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 16, Issue 1
Displaying 1-5 of 5 articles from this issue
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  • Tohoku University Isotope Separator.
    HIDEHIRO GOTO, SHIN SUZUKI, MOKUYOSHI KISHIMOTO
    1968 Volume 16 Issue 1 Pages 1-15
    Published: March 31, 1968
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5702/massspec1953.16.1
    JOURNAL FREE ACCESS
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    The general aspect of the isotope separator, installed in The Research Institute for Iron, Steel and Other Metals, Tohoku University, is described. Several operational characteristics as well as the working conditions for the isotope separation of both magnesium and iron are presented. In the separation of iron isotopes, content of Fe+ ion in the ion beam increased with increasing flowing rate of argon gas into ion source where ferrous chloride was charged as original materials. This phenomenon is advantageous for improving the yield of iron isotopes. The total efficiency was 0.15% for magnesium 25 fraction and 0.7% for iron54fraction
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  • Characteristics of RPD Ion Source of Time-of-Flight Mass Spectrometer, and Measurement of the Ionization Potential and the Appearance Potentials of Trioxymethylene
    MINORU KUMAKURA, TOSIO SUGIURA, SEIZO OKAMURA
    1968 Volume 16 Issue 1 Pages 16-22
    Published: March 31, 1968
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5702/massspec1953.16.16
    JOURNAL FREE ACCESS
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    Characteristics of the RPD ionization source which is used to measure the ionization and the appearance potentials, have been studied using Time-of-Flight mass spectrometer. By selecting appropriate potentials of the electrodes of the RPD electron gun, monochromatic electron beam having about 0.1 eV energy spread, has been obtained with an efficiency of 23% of total electron current. It has been confirmed that this ionization source is useful to measure the appearance potential, by measuring the ionization efficiency curve of the Kr+ ion.The ionization efficiency curves of the parent and several main fragment ions produced from the trioxymethylene (Tox) by electron impact, have also been measured from a stand-point of radiation chemistry. The lst ionization potential of the parent ion (10.59±0.05 eV) coincides with the lst appearance pointial of the (M-1)+ ion. In the ionization efficiency curve of the parent ion, a hump, which is attributed to autoionization process, is found at 0.3 eV above the threshold of the lst ionization potential. In the ionization efficiency curve of the CH2OCH20H+ ion, the curve at the lst onset shows the shape of step function, that is considered to show the autoionization or ion-pair production process. Some pronounced bresks have also been observed in the ionization efficiency curves. The results have been discussed together with the information of metastable ion peakes observed by the conventonal mass spectrometer.
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  • Analysis of Mixed Drugs by Mass Spectrometry, X. Pesticide Analysis (2), Analysis of Pesticide from their Preparations
    A. TATEMATSU, H. YOSHIZUMI, T. GOTO
    1968 Volume 16 Issue 1 Pages 23-29
    Published: March 31, 1968
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5702/massspec1953.16.23
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    As a Preliminary study of pesticide analysis by mass spectrometry, we examined the experimen tal conditions for obtaining spectra of several organic phosphorus compounds. (1) Identification of Pesticide from the various commercial Preparations: Commercially available dichlorodiphenyl trichloroethane emulsion (DDT) and hexachlorobenzene powder(γ-BHC)contain various surfactants and diluents, but these preparations give the spectra of respective pure compouds by direct measurement. (2) Temperature Dependene: Although low temperature measurements are expected to be suitable for good reproducibility, almost no change of spectra was observed for the temperature range of 100-200°C. (3) Effect of Time: The intensities of the molecular peak and fragment peaks weres table for 60 minutes. These results indicate that the quantitative analyses of pesticides by mass spectrometric deter mination seem to be very attractive.
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  • Mass Spectrometer with Diverging Electric Field
    HISASHI MATSUDA
    1968 Volume 16 Issue 1 Pages 30-36
    Published: March 31, 1968
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5702/massspec1953.16.30
    JOURNAL FREE ACCESS
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    A double focusing mass spectrometer with a diverging electric field and a uniform magnetic field is proposed. The diverging electric field has focusing action similar to that of a concave lens and can be produced by a kind of toroidal condenser. This type of mass spectrometer has considerably smaller size as compared with the ordinary mass spectrometer with the same resolving power. Dispersion, resolving power and the second order aberrations are discussed, and typical examples are shown.
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  • Organic Mass Spectrometry
    AKIRA TATEMATSU
    1968 Volume 16 Issue 1 Pages 37-54
    Published: March 31, 1968
    Released on J-STAGE: July 05, 2011
    DOIhttps://doi.org/10.5702/massspec1953.16.37
    JOURNAL FREE ACCESS
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