Journal of the Mass Spectrometry Society of Japan

Negative Ions, Formations and Properties

Toshio Sugiura

1979 Volume 27 Issue 4 Pages 217-245
Published: December 29, 1979
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.27.217

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An Investigation of Structure of Intermediate Ions from Several Substituted Alkyl Benzoates by the ortho Effect and Kinetic Energy Release

Susumu Tajima, Tadashige Azami, Toshikazu Tsuchiya

1979 Volume 27 Issue 4 Pages 247-254
Published: December 29, 1979
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.27.247

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Single and double hydrogen atom transfers in reactions (1) and (2) are found in the mass spectra of n-propyl and n-butyl benzoates, and n-propyl and n-butyl p-hydroxy-benzoates. In contrast, only single hydrogen atom transfer is found in the mass spectra of n-propyl and n-bulyl salicylates and it is concluded that the hydrogen bond prevents the second hydrogen atom transfer. The kinetic energy release for the loss of water from the m/z 138 ion[C7H6O3]⁺ produced from ethyl and higher alkyl salicylates by a McLafferty rearrangement was nearly equal to that from the molecular ion of salicylic acid (m/z 138). The kinetic energy release for the loss of water from the m/z 137 ion[C7H7NO2]⁺ from ethyl o-aminobenzoate was also equal to that from the molecular ion of o-amino benzoic acid (m/z 137). However, the corresponding kinetic energy release from the m/z 136 ion[C8H8O2]⁺ from ethyl o-methylbenzoate was somewhat higher than that from the molecular ion of o-methyl benzoic acid (m/z 136).

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Determination of Molybdenum in Nickel-Base Heat-Resisting Alloys by Isotope Dilution Mass Spectrometry

Shuzo Tamura

1979 Volume 27 Issue 4 Pages 255-261
Published: December 29, 1979
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.5702/massspec1953.27.255

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Molybdenum contents of 3 to 9 wt percents in several analytical standad materials, mainly nickel-base heat-resisting alloys(JAERI and NBS), were determined by isotope dilution mass spectrometry. The technique involved acids-digestion of a chipped sample and addition of a 96 atomic percent Mo-96 spike solution into aliquoted sample solutions prior to isotope analysis. A carbonization technique was applied in single filament surface ionization mass spectrometry in order to make molybdenum isotop ratio measurements simple and reproducible. Except for the samples containing niobium and/or zirconium, the method was capable of obtaining molybdenum contents with relative standard deviations of 0.5 to 1 percent, without separation of element from the matrix. the samples contained niobium and/or zirconium, it is preferable to separate them by precipitation of molybdenum with α-benzoinoxime in order to shorten the overall analysis time.

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A Mass Spectrometric Study of Vaporization of Li2O with Some Refractory Metal Cells

Yasushi Ikeda, Hiroyuki Ito, Genichi Matsumoto, Shoichi Nasu

1979 Volume 27 Issue 4 Pages 263-273
Published: December 29, 1979
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.27.263

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The vapor pressure of lithium monoxide(Li2O)has been obtained by high temperature mass spectrometry. The partial pressures of Li, O2 and Li2O gaseous molecules have been determined experimentally and several thermodynamic data for the reaction (1)Li2O(s)=2Li(g)+1/2O2 and for the reaction(2)Li2O(s)=Li2O(g)have been calculated. The third law enthalpy ΔH0^o;obtained for the reaction(1)is 909 ±4 kjoule mole^-1;, being in good agreement with published data. The minor vapor species such as LiO, Li3O and Li2O2 were also detected. A compatibility investigation has been undertaken using Knudsen effusion cells fabricated from various refractory metals. The order of oxidation of refractory with Li2O has been determined as follows, Pt<Ni<Ta<Mo=Nb.

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Mass Spectrometric Studies of Sulfur Compounds: The Alpha and Beta Substituted Naphthylthiaalkanes

Norman G.Foster, Robert W.Higgins, Mynard C.Hamming

1979 Volume 27 Issue 4 Pages 275-285
Published: December 29, 1979
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.27.275

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The mass spectra of fifteen members of the alpha and beta substituted naphthylthiaalkanes with a molecular weight range of 202 to 300 are reported. The data areused to illustrate the process of correlation and delineation of fragmentation routes in a class of compounds to benefit mass spectroscopists. Spectra from low, medium, and high resolution instruments are employed, showing the necessity and usefulness of multiple approaches in obtaining a complete understanding of the pathways involved. Application of low ionization voltage, metastable ion data, doubly charged ions, and high resolution mass spectrometry is described to arrive at an outline of the major fragmentation routes in a given class of compounds. For unknown compounds in their class, the analyst can readily make an identification from the predicted mass spectrum by utilizing this information.

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Quantitative Mass Spectrometry in Biochelnistry and Medicine

W.D. Lehmann, H.-R. Schulten, Tetsuya Komori, Misuzu Kawamura, Toshio ...

1979 Volume 27 Issue 4 Pages 287R-308R
Published: December 29, 1979
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.27.287R

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[in Japanese]

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[title in Japanese]

H.-R. Schulten, W.D. Lehmann, [in Japanese], [in Japanese]

1979 Volume 27 Issue 4 Pages 309R-320R
Published: December 29, 1979
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.27.309R

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