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 23, Issue 2
Displaying 1-8 of 8 articles from this issue
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  • Emission Spectra and Excitation Functions of. CS2, NO, N2O, and NO2 by Low Energy Electron Impact
    KIYOSHI FUKUI, IWAO FUJITA, KEIJI KUWATA
    1975 Volume 23 Issue 2 Pages 105-117
    Published: July 31, 1975
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.23.105
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    Emission spectra of CS2, NO, N2O, and NO2 in the region240-650nm and their excitation cross section curves(excitation functions)were obtained under low energy electron impact(2-25eV)at a gas pressure of 10-6-10-5Torr. The excitation functions obtained were for the following processes:(1)CS2→CS2*, (2)NO→NO(A)*, (3)N2O→N2(C3IIu)+O, (4)N2O→N2O+*+e-, (5)NO2→NO2*, (6)NO2→NO(A and/or B)+O. The lowest emission state of3∑+u besides the 3A2 state for CS2 was observed in the region400-600nm. The excitation function for NO2 supported the existence of the two emission states(the doublet and quartet states)in the region 400-600 nm. Some resonant peaks were found in the excitation functions for CS2, NO, and NO2. The apparent features of the curves for the process(4)were consistent with the threshold law.
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  • The Analysis of 235U Isotope Ratio by A Mass Spectrometer for UF6
    YUUKOU NAGATORO, HIROMI TOKOI, KATSUMICHI SUZUKI, EISKE MITANI, NORIHI ...
    1975 Volume 23 Issue 2 Pages 119-125
    Published: July 31, 1975
    Released on J-STAGE: July 05, 2011
    DOIhttps://doi.org/10.5702/massspec1953.23.119
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    The mass spectrometer for the precise determination of 235isotope ratio on UF6has been developed.The resolving power of this apparatus is 330. The UF+5 ion currents are measured with the accuracy of less than 0.1% by controlling the room temperture and humidity and by shielding the preamplifier. The isotope ratios of 235U are determined with the relative error of less than 0.1% by using the interpolative method. The time required for measuring one sample is less than15minutes.
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  • Production of 53Mn by 52Cr(d, n)Reaction
    SEIICHI SHIBATA, YOSHIMASA TAKASHIMA, REISUKE GENSHO, MASATAKE HONDA
    1975 Volume 23 Issue 2 Pages 127-132
    Published: July 31, 1975
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.23.127
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    Mass spectrometry was applied to the measurement of production cross section for the nuclear reaction 52Cr(d, n)53Mn. Enriched 52Cr metal target of about 60 mg/cm2 was prepared on a copper plate holder by electrodeposition and was bombarded with deuterons in a cyclotron. Manganese was extracted and purified without using carrier from bombarded targets by anionuexchange and solvent extraction. The isotopic ratio 53Mn/ 55ccMn was measured by mass spectrometry and the amount of 55Mn was determined by neutron activation analysis.The ratio was up to2×10-2.The activity due to byproduct 54Mn was about 5000 times higher than that of 53Mn and it was attributed to 53Cr impurity occurred at a level of 0.1% in the target through 53Cr(d, n)54Mn. The activities of 53Mn obtained were 5-80dpm by60-160 millicoulombs of 8.3-20.0 MeV, deuterons. The average cross sections were estimated in each experiment and were compared with those of the analogous nuclear reactions.
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  • Measurements of Velocity Distributions of Thermal and Velocity-Selected Potassium Beams Scattered from the Surfaces of LiF and Graphite by Means of Time-of-Flight Method
    SHINJI TOMODA, ISAO KUSUNOKI, SEIICHIRO MATSUMOTO
    1975 Volume 23 Issue 2 Pages 133-140
    Published: July 31, 1975
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.23.133
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    A time-of-flight method has been developed with a pulse counting technique in order to measure the velocity distribution of alkali atoms scattered from the solid surface. Time-of-flight spectra of potassium atoms scattered from the cleaved surfaces of LiF and graphite are observed and compared with theoretical curves which are calculated on the assumption of the Maxwellian distribution of velocities. All the spectra agree quite well with the Maxwellian distributions characteristic of the surface temperatures. Similar experiments performed with velocity-sel cted incidentbeams show essentially no difference in results in the energy range of 0.08 to 0.15 eV. From the present result, it is concluded that the cosine distribution observed in our previous experiments is due to the complete accommodation of potassium atoms with the surfaces.
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  • Ions Produced by the Positron Decay of 18F
    MICHI ARATANI, NOBUFUSA SAITO
    1975 Volume 23 Issue 2 Pages 141-144
    Published: July 31, 1975
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5702/massspec1953.23.141
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    Measurements have been made on the ion species produced by the positron decay. As a positron emitter, 18F was employed.The radionuclide, 18F(t1/2:110m)was produced by the160(3He, p)18F reaction, using IPCR Cyclotron. The 18F trapped on metal plates were employed as the ion source of a pulse-counting mode of mass spectrometer. The apparatus was the same as previously reported. The ion-expelling voltage was4.5-5.0kV. The result with the18F on the copper plate was as follows:m/e18, 9.5;m/e9, 1.0;m/e6, 1.4;m/e4.5, 2.5;m/e2.8, 4.0. The positrbn decay of 18F and the innershell ionization of 18O formed from 18F may be responsible for this type of spectrum. The yields of the highly charged ions fluctuated with the 18F on the copper plate. However, the fluctuation was not observed with 18F on stainless steel.
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  • Mass Spectra of α-Substituted o-Methoxybenzyl Alcohols
    HIROKO ENDO, MINORU HIROTA
    1975 Volume 23 Issue 2 Pages 145-151
    Published: July 31, 1975
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.23.145
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    The mass spectra of various α-alkyl and α, α-dialkyl-o-methoxybenzyl alcohols were measured, and their fragmentation pathways were discussed. With the aid of metastable ion peaks and of the spectra of some deuterated derivatives, the mechanism of the fragmentation was deduced and compared with those of simple benzyl alcohols and anisole. Considerable effects of the α-substituents on the fragmentation pathway is observed and interpreted by taking into accounts the easiness of the Cα-Calkyl bond fission.
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  • Pressre Effect on The Peaks due to(P-HCN)+Ion in Mass Spectra of Pyridines
    MITSUO UCHIDA
    1975 Volume 23 Issue 2 Pages 153-156
    Published: July 31, 1975
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.23.153
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  • Potential Energy Curves of Dissociation and Changes of Unpaired Electron in the C-N and C-C Cleavages of the Ground-State Ethylamine Ion
    HIROSHI ICHIKAWA, MICHIHIKO OGATA
    1975 Volume 23 Issue 2 Pages 157-160
    Published: July 31, 1975
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.23.157
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