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 12, Issue 26
Displaying 1-7 of 7 articles from this issue
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  • Structure Analysis of High Molecular Organic Compounds with their Fragment Ions produced by Electron Impact
    YASUO NAKAJIMA, HIRSOHI SATO, JUNICHI OKAMOTO, TADAHIRO KATO, YOSHIO K ...
    1964 Volume 12 Issue 26 Pages 65-76
    Published: October 31, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.12.65
    JOURNAL FREE ACCESS
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    The mass spectra of 8, 8-dicyanoheptafulvene and its derivatives, which are considered to belong to a nonbenzenoid aromatic compound, were measured. The high degree of aromaticity of8, 8-dicyanotheptafulvene was made clear by masss pectrometry. Low mass regions of dicyanoheptofalvene showed the elimination of HCN from parent ion and rearrangement to phenvlpropiolonitrile ion. The mass spectra of methoxy-dicyanoheptafulvenes showed fragmentation quite different from that 8, 8-dieyanoheptafulvenes. The structure and fragmentation processes of dieyanoheptafulvenes were discussed.
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  • High-kinetic Energy Fragment Ions from Aliphatic Hydrocarbons Under Electron Impact.(II). Propane
    TOSHIKAZU TSUCHIYA
    1964 Volume 12 Issue 26 Pages 77-80
    Published: October 31, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.12.77
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    Kinetic energies of fragment ions from propane under electron impact were measured. A part of the ions of m/e13, 14, 15, 26, 27and 28 was found to have appreciable kinetic energies ranging from 1.1 eV to 2.5 eV. The lighter a ion is, the higher is the kinetic energy. Assuming conservation of momentum of the ions, reactions producing high-kinetic energy fragment ions were discussed.
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  • Relative Sensitivity Coefficients of Elements in Spark Source Mass Spectrometry
    JUNJIRO KAI, MASAYO MIKI
    1964 Volume 12 Issue 26 Pages 81-88
    Published: October 31, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.12.81
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    The relative sensitivity coefficient of an element in spark source mass spectrometry is defined, and the coefficients of several elements in the matrices of Al, Fe, Ti, and Cu were determined. Results are as follows(Fe:1):Mg 12.1, Si 2.0, P 3.6, Ti 1.6, V 1.4, Cr 1.4, Mn 2.0, Co 0.85, Ni 0.68, Cu 1.2, Zn 3.1.
    The variations of measurements are about ±50%, and no significant evidence of matrix effect is seen. The physical meaning of the relative sensitivity coefficient is discussed and a rough correlation between the coefficient and the heat of sublimation and the ionization potential of the element is examined.
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  • Out-gases evolved from Ceramics in Vacuum at Room Temperature
    SHINICHIRO YAMAMOTO, TSUNEKIYO IWAKAWA, HIROHIKO HATTORI
    1964 Volume 12 Issue 26 Pages 89-92
    Published: October 31, 1964
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.5702/massspec1953.12.89
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    Gas evolution from ceramics in vacuum at room temperature was studied by mass-spectrometric method. As the gas evolution rates from ceramics at room temperature after the degassing at 400°C for 2 hours in vacuum were too small to measure by dynamic method, gases were stored in a glass-ampoule with side tubes, each sealed with a breakable joint. Joining a side tube to a mass-spectrometric gas analysor, and breaking the breakable joint, gases evolved from ceramincs were analyzed.
    It was found that (1) argon-evolution rates from various ceramics decreased in the order of, baked talc > steatite > forstelite > alumina ceramics; (2) argon-evolution rates from steatite varied from sample to sample, i.e. 1.7×10-6-14×10-6cc. Torr/g for a storage time of about 50 days; (3) the analysis showed compositions of the out-gases from ceramics were like that of air; and (4) the time constant of argon evolution was8.7days to an example of steatite during the measurement of 60 days.
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  • Ion-Molecule Reactions of Methanol
    TATUO YAMAMOTO, YOSHIHARU SHINOZAKI, GISUKE MESHITUKA
    1964 Volume 12 Issue 26 Pages 93-98
    Published: October 31, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.12.93
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    Ion-molecule reactions of CH3OH, CH3OD, CD3OH and CD3OD have been investigated using a mass spectrometer. Secondary ions formed by H+or D+transfer(by or H or D abstraction)were observed, but no secondary ion of the mass number higher than these reaction products was detected. The reaction of parention was measured using the electron energy of slightly higher than the ionization potential of methanol in order to avoid the contribution of daughter ions. The contribution of daughter ions was checked by changing electron energy at constant gas pressure. The results obtained are as follows: 1. The cross section of the ion-molecule reaction by the proton transfer from methyl group of parent ion to neutral molecule is greater than that of proton transfer from hydroxyl group. 2. Ion-molecule reactions by daughter ions which give the same secondary ions as those by parent ion, also can occur. In the case of the daughter ion CH2OD+, the cross section of D+transfer from hydroxyl group is greater than that of H+transfer from methyl group. 3. An isotope effect for the total cross section, if any, is very small, but an isotope effect between H and D in the same methanol molecule is clearly observed.
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  • Mass Spectrometric Investigation of Petroleum(VI)
    The Effbct of Alkyl Side Chain of Aromatic Compounds on Liquid Chromatography.
    SHOZO OSHIMA, KINYA FUJII
    1964 Volume 12 Issue 26 Pages 99-104
    Published: October 31, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.12.99
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    The effect of alkyl side chain of aromatic compounds on liquid chromatography was studied. Aromatic fraction from Kuwait gas oil was separated into 40 cuts by liquid chromatography of alumina column. The resulting cuts were measured by mass spectrometer to trace the carbon number distribution of each type of aromatic compounds. The relationship between the change in carbon number distribuiton and elution order was studied. On naphthalene, benzothiophene, and acenapththene-biphenyl series, ploting the mean carbon number of alkyl side chain against the volume of effluent run out the column, monotone decreasing curves were obtained. It has been shown by this study that alkyl side chain decreases the adsorption affinity of the molecule to alumina and that the greater alkyl group reduces adsorption affinity. According to the increase in the carbon number of alkyl chian in the molecule, this effect becomes more significant. Chromatographic features of aromatic fraction in Kuwait gas oil were also studied.
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  • Ion Optics(II)
    [in Japanese]
    1964 Volume 12 Issue 26 Pages 105-114
    Published: October 31, 1964
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.5702/massspec1953.12.105
    JOURNAL FREE ACCESS
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