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 32, Issue 1
Displaying 1-10 of 10 articles from this issue
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  • Study on Charge Transfer Reaction of Several Organic Molecules with Accelerated Rare Gas Ions
    Makoto Takahasi, Sachiko Okuda, Eiichi Arai, Akira Ichinose, Masaaki T ...
    1984 Volume 32 Issue 1 Pages 97-114
    Published: 1984
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.32.97
    JOURNAL FREE ACCESS
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    Observing the charge transfer mass spectra of ethylbenzene, cyclobutane and methanol in Ar and Xe ion impacts, we investigated the dependence of the secondary ion peak intensities (normalized to primary ion current and target pressure) on the translational energy of primary ions (0-3500 eV). In the case of ethylbenzene, several maxima of the secondary ion peak intensities were observed in Ar and Xe ion impacts. The correlation between the maxima and the primary ion energy was examined in terms of near adiabatic theory of Massey. Supplementary studies on the energy distribution of primary ion, charge transfer cross section between methanol and Xe ion, and final product analysis in rare gas ion irradiation on cyclobutane were described.
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  • Information about Fragmentations of Oligosaccharides Molecular Ions by Negative In-beam CI Method:
    Using Microheater
    Kazuo Tsujimoto, Yasuo Shida, Mamoru Ohashi, Yasuji Yamada
    1984 Volume 32 Issue 1 Pages 115-120
    Published: 1984
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.32.115
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    Negative in-beam CI mass spectra of several oligosaccharides were obtained by use of a heatable ceramic probe which was capable of heating rates up to 100°C/s and of temperatures up to 1000°C. In-beam ionization using this heating probe and a CI ion-source corresponds to “flash desorption CI” and made it possible to obtain not only the quasimolecular ion of stachyose but also cluster ions of glucose and sucrose. Accurate mass measurements of the molecular ion of maltotriose were successfully carried out. Linked scanning of the cluster ion, [2M-1]- of glucose elucidated the fragmentation processes of the cluster ion involving successive losses of (CH2O)n and H2O.
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  • Molecular Secondary Ion Mass Spectrometry of Oligosaccharides Assisted by Amide Matrices
    Ken-ichi Harada, Fumiko Ochiai, Makoto Suzuki, Yoko Numajiri, Toyoya N ...
    1984 Volume 32 Issue 1 Pages 121-128
    Published: 1984
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.32.121
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    In order to seek for a good matrix material for neutral oligosaccharides instead of DEA in molecular SIMS, we examined seven amide compounds which possess intermediate proton affinity between glycerol and DEA. Among them, HEF, PR and PP were available for our purposes. The amide matrices-assisted mass spectra give surely both molecular adduct ions ([M + × + H]+, × = HEF, PR and PP) and some sequence ions. Additionally, the metastable ion spectra of [M + × + H]+ under linked scanning (B/E) conditions gave structurally reliable information.
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  • In-Beam EI, CI and SIMS Spectra of N-Methylnicotinamide Analogues
    Mamoru Ohashi, Kiyoshi Shohara, Kazuo Tsujimoto, Yasuo Shida
    1984 Volume 32 Issue 1 Pages 129-135
    Published: 1984
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.32.129
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    In-beam EI, CI and glycerol assisted SIMS spectra of three isomers of 1-methylcarbamoylpyridinium salts were investigated. The in-beam EI and SIMS spectra exhibited the intact 1-methylcarbamoylpyridinium cations at m/z 137. Thermal decomposition of the salts under in-beam EI conditions was found to give the volatile demetylated compounds as well as the hydrogenated and methylated neutral species which were similar to those observed in the FD spectra of 1-methyl-3-carbamoylpyridinium chloride. The major fragment ions of the salts under in-beam EI conditions were found to be derived from those species on the basis of the results obtained by single ion monitoring and linked field (B/E) scanning techniques. The comparison of the in-beam CI spectra with the corresponding EI spectra also clarified the thermally produced neutral species under in-beam conditions. SIMS spectra exhibited the intact 1-methylcarbamoylpyridinium cations as the base peaks and fragment ions at m/z 94, but did not exhibit any characteristic fragmentations for the structural isomers. From these results it is deduced that the 1-methylcarbamoylpyridinium cations observed in the in-beam EI spectra are mainly derived from the thermally hydrogenated species and the fragmentation processes of the cations are similar to those of SIMS.
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  • Mass Spectroscopic Studies on Antibiotics, Saframycins
    Kazutaka Fukushima, Tadashi Arai, Kazuo Tanaka
    1984 Volume 32 Issue 1 Pages 137-145
    Published: 1984
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.32.137
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    The EI, FD and FAB mass spectra of saframycins, isoquinolinequinone antibiotics, have been examined. The FD spectra gave intense molecular ions as the base peak in all cases. The general fragmentation pattern observed in EI and FAB spectra has been discussed. In particular, unique and significant fragment ions for structural study of the antibiotics were found in the FAB spectra.
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  • Mass Spectra of Diethyl 2-Alkyl-3-oxoglutarates
    Yoshinobu Naoshima, Toru Nakayama, Tadamasa Suehiro, Hirokiyo Kondo, S ...
    1984 Volume 32 Issue 1 Pages 147-152
    Published: 1984
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.32.147
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    Mass spectra of ten different diethyl 2-alkyl-3-oxoglutarates (1-10), which have been used as intermediates to synthesize a variety of biologically active compounds, were measured by using direct inlet system under electron impact ionization, and their characteristic fragmentations were discussed.
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  • Mass Spectroscopic Studies on the Diels-Alder Adducts from the Root Barks of Mulberry Tree.
    Kazutaka Fukushima, Toshio Fukai, Taro Nomura
    1984 Volume 32 Issue 1 Pages 153-167
    Published: 1984
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.32.153
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    Mass spectra of a series of natural Diels-Alder adducts obtained from root barks of Mulbbery tree were measured by electron impact (EI) and field desorption (FD) ionizations.
    A retro Diels-Alder fragmentation, which was observed in the spectra of all compounds, and the general fragmentation pattern of the adducts have been discussed. Furthermore, the fragmentation observed in a fast atom bombardment (FAB) study of some samples is also described.
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