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 11, Issue 24
Displaying 1-9 of 9 articles from this issue
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  • Non-Converging Field and Mass Spectrograph
    HISASHI MATSUDA
    1964 Volume 11 Issue 24 Pages 127-140
    Published: March 30, 1964
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5702/massspec1953.11.127
    JOURNAL FREE ACCESS
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    Ion optical properties of the sector type fields which diverge ion beam (diverging field) and of those which have no lens action but have dispersive action (dispersing field) are discussed. If the magnetic field is expressed as Hz=Horn and electric field as Er=Eorl approximately, then the field with n<-1 or l<-3 is diverging field, and that with n=-1 or l =-3 is dispersing field.
    Diverging field forms the virtual image and the dispersion at the virtual image is given by(a/k2) (X-1)δ', where a is the mean radius, k2=-(n+1)or-(l+3), X the magnification and δ'=γ+β (magnetic field) or γ+2β (electric field) .(γ and β are fractions of mass and velocity respectively.) A very small single focus mass spectrometer is proposed by combining 60° magnetic diverging field (k=1) and electric quadrupole lens in tandem, and a very small double focus mass spectrometer is designed by the combination of the 60 ° electric diverging field (k=1) and the 60 ° uniform magnetic field. These mass spectrometers are about one half in size compared with the ordinary mass spectrometers with the same resolving power.
    The dispersive action of the dispersing field is analogous to the optical prism. The dispersion angle is given by Φδ', where Φ is the deflection angle of the field, and is independent of the radius. When the ordinary sector type analyzer is separated in two at the point where ion beam becomes parallel and the dispersing field is inserted between them, the total dispersion and resolving power is increased several times but the total size of the apparatus does not become so large. For example, when 315 ° dispersing magnetic field is inserted between 30°-30° uniform magnetic fields, both dispersion and resolving power are increased about 6.5 times as large as those of the 60° uniform magnetic field of the same radius.
    Double focusing mass spectrograph with the resolving power of the order of 107 is designed by using the above principle. This apparatus consists of toroidal electric field, γ-1magnetic field and uniform magnetic field and the total ion path is less than 10 m.
    The ion orbit in the above fields is also calculated in the second order approximation.
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  • A Mass Spectrometer for Photo-Ionization and Microanalysis(I)
    Characteristics of Static Operation and Vacuum
    TOSHIO SUGIURA, YOSHINORI INOUE, OSAMU TOYAMA, TERUO HAYAKAWA, JUNICHI ...
    1964 Volume 11 Issue 24 Pages 141-154
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.141
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    A mass spectrometer for photo-ionization by vacuum ultra-violet light and for microanalysis by static operation was constructed in University of Osaka Prefecture. The analyser tube and ion source can be baked out up to about 400° and 300°C, respectively. The other parts of the mass spectrometer can be baked out at about 130°C. By total 250 hours' baking out and evacuation end vacuum reached to 2×10-9 mmHg, and almost no background peak was detected under dynamic operation by an usual type d. c. amplifier. When static operations were carried out under these experimental conditions, main residual gases of hydrogen, methane and carbon monoxide increased for the duration of static operation. The evacuation rates by the Bayard-Alpert type ionization gauge were measured for hydrogen, methane, carbon monoxide, carbon dioxide, argon, neon and helium. The results indicate that the evacuation rates of hydrogen and methane by the Bayard-Alpert type ionization gauge are considerably large, and that the evacuation rates of noble gases have correlation to their ionization probabilities. The sensitivities in item of A/μcc NTP of noble gases for analysis by static operation were measured, and the results show that the sensitivities(A/μcc NTP)of 40 Ar, 20Ne and 4He are 6.39×10-13, 1.26×10-13 and 6.92×10-14, respectively. Further measurements using a Cu-Be twelve-stage secondary electron multiplier have been continued.
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  • New Recording Method of Mass Spectrum
    SABURO MAGARI, KOKICHI HOTTA
    1964 Volume 11 Issue 24 Pages 155-158
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.155
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    Digitization of mass spectra has been carried out with the maximum peak height holder and a conventional digital voltmeter. The operation of the holding circuit was described in detail. Then storage tube type mass spectrometer recorder was described briefly.
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  • Mass Spectrometric Analysis of Fissiogenic Xenon and Krypton in Uranium Minerals
    J. OKANO
    1964 Volume 11 Issue 24 Pages 159-166
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.159
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    Isotopic abundances of xenon and krypton extracted from four kinds of uranium minerals were measured with a high sensitivity mass spectrometer. Experimental procedures of the extraction and the purification were described. The mass spectrometric analysis was carried out under static operations using xenon and krypton samples of 10-10-10-7 cc STP. In order to obtain the relative yields of xenon and krypton isotopes in U238spontan eous fission, the observed patterns were corrected for the neutron fission components and for the normal gas components. The spontaneous fission product patterns of xenon isotopes obtained from the pitchblendes(U: 35-70%)were in good agreement with that reported by Young and Thode. But the pattern obtained from the kobe-ite sample(U: 4.6%)differed to some extent from those. Conceivable reasons for this discrepancy were discussed.
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  • On the Measurements of Separation Factor for Boron Isotope Exchange
    RYOHEI NAKANE, OSAMU KURIHARA
    1964 Volume 11 Issue 24 Pages 167-172
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.167
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    The values of single-stage separation factor for the boron isotope exchange between boron fluoride gas and its weak complexes that are stable only at low temperatures are determined by means of the shaking-type gas-liquid contactor and mass spectrometer.
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  • On the Geochemical Studies of Stable Isotopes
    (I)On the Standard or Reference Samples
    MAKOTO SHIMA
    1964 Volume 11 Issue 24 Pages 173-180
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.173
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    Within recent years the stable isotope ratio has become one of widely used tools of the geochemistry. The method is based on the measurement of the mass-spectrometory. On the geochemical study, one of the most important problem is the standard or reference samples which are compared among the different researchers. There has not been general agreement in the field concerning the standard or reference samples on the various laboratories except a few elements. The work described in this report was initiated on behalf of the geochemist who has been used the stable isotope.
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  • Mass Spectrometric Investigation of Petroleum(IV)
    Mass Spectrometric Analysis of Thiophene Type Compounds in Gas Oil
    SHOZO OSHIMA, KINYA FUJII
    1964 Volume 11 Issue 24 Pages 181-184
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.181
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    The thiophenic sulfur compounds in poly-aromatic fraction of Kuwait gas oil were analyzed by low voltage ionization method. The sulfur compounds which have the same mass number series with the aromatic hydrocarbons in the spectrum of low voltage ionization were separated by liquid chromatography and which could not be separated completely from the aromatic hydrocarbons were analyzed by distribution curve method. It became evident that this method is useful for the analysis of sulfur compounds under coexsistence of hydrocarbons. The abundance order of the thiophenic sulfur compounds were benzothiophenes, dibenzothiophenes, 2, 3 dihydro-benzothiophenes and tetra-hydro-di-benzothiophenes. The thiophenes were accounted as the biphenyls and their abundance is considered to be very small in gas oil fraction. The carbon number of alkyl side chain on the most abundant molecules of above four compound types were 6, 4, 5 and 3 respectively.
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  • Modification of the Ion Source Circuit of CEC 21-103 Mass Spectrometer for Ionization by Low-Energy Electrons
    YOSHIHIRO MASUDA
    1964 Volume 11 Issue 24 Pages 185-190
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.185
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1964 Volume 11 Issue 24 Pages 191-199
    Published: March 30, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.11.191
    JOURNAL FREE ACCESS
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