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 35, Issue 2
Displaying 1-5 of 5 articles from this issue
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REGULAR PAPERS
  • Construction of a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer usinga Superconducting Magnet. I.
    Masao Inoue, Makoto Fujiwara, Masaru Onoyama, Yutaka Goto
    1987 Volume 35 Issue 2 Pages 42-54
    Published: 1987
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.35.42
    JOURNAL FREE ACCESS
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    This paper reports a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer built in this laboratory. The spectrometer consists of a 5 Tesla superconducting magnet, a cylindrical trapped ion cell with an electron beam source, electronic circuits, a microcomputer which generates pulse sequence and controls a data acquisitions system, and a personal computer.
    The mass spectrum of xenon isotopes has been obtained by a preliminary experiment. An intense low frequency signal of several hundreds Hz was observed along with the time domain transient signals of ion cyclotron resonance frequencies. The former can be attributed to the rotation of the center of cyclotron motion of ions about the cell axis. This rotational motion is caused by the drift due to the radial electric field component and the magnetic field gradient produced in the plane perpendicular to the cell axis.
    Analysis of the inhomogeneities of electric and magnetic fields inside the cell and the motion of ions has been carried out and the variation of the frequency of rotation as a function of the kinetic energy of ions has been studied.
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  • Activity Measurement for Surface Segregated Type 316 Stainless Steel by Mass Spectrometry and Auger Electron Spectroscopy
    Tadafumi Koyama, Masayoshi Kanno, Michio Yamawaki
    1987 Volume 35 Issue 2 Pages 56-62
    Published: 1987
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.35.56
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    Vaporization of Type 316 stainless steel was studied by means of the mass spectrometer-Knudsen cell combination method together with the surface analysis by Auger electron spectroscopy. Anomalously large apparent activity coefficient was observed for chromium component, which was attributed to its surface segregation as determined by surface analysis. Surface analysis is concluded to be an important tool in the activity measurement of solid solution systems to be performed with the Knudsen effusion method.
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  • Precise Measurement of Cerium and Lanthanum Isotope Ratios
    Akio Makishima, Hiroshi Shimizu, Akimasa Masuda
    1987 Volume 35 Issue 2 Pages 64-72
    Published: 1987
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.35.64
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    The isotope ratios of cerium and lanthanum are determined precisely by a surface ionization mass spectrometer. 138Ce/142Ce and 140Ce/142Ce ratios for Ce standard solution are 0.0225762± 0.0000014 (2σ) and 7.9471±0.0003 (2σ), normalized to 136Ce/142Ce=0.01688, respectively. 138La/139La ratio is 0.0009025±0.0000005 (2σ). The oxygen isotope ratios in measurements of REE as oxide ions are 0.0003916±0.0000014 (2σ) and 0.002129±0.000010 (2σ) for 17O/16O and 18O/16O. The isotopic abundances (%) of 136Ce, 138Ce, 140Ce and 142Ce are calculated to be 0.1878, 0.2512, 88.433 and 11.128, respectively. The isotopic abundances (%) of 138La and 139La are calculated to be 0.09016 and 99.9098. These isotopic abundances obtained here give the following relation:
    (138La/142Ce)ATOMIC=0.008173×(La/Ce)WEIGHT.
    These precise isotopic abundances on Ce and La are fundamental values in a La-Ce geochronometer.
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  • Mass Spectrometric Study of Acetaldehyde Oxidation in Shock Waves
    Yoshiaki Hidaka, Masao Suga
    1987 Volume 35 Issue 2 Pages 74-83
    Published: 1987
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.35.74
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    The oxidation of acetaldehyde was studied with a shock tube connected with a mass spectrometer over the temperature range 1400-1700 K and the total pressure range 200-400 Torr. The induction period τ was measured by monitoring the oxygen concentration, and the following equation was found, τ=1.24×10-12 [CH3CHO] 0.4 [O2] -0.8 exp (41000/RT) s, where the concentration is expressed in mol/cc. Data analysis using 48-reaction mechanism was carried out, and the mechanism was discussed.
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  • Acid Spray for Enhancement of MH+ Ion Intensity in Secondary Ion Mass Spectrometry
    Setsuko Seki, Hideki Kambara
    1987 Volume 35 Issue 2 Pages 84-89
    Published: 1987
    Released on J-STAGE: May 01, 2007
    DOIhttps://doi.org/10.5702/massspec.35.84
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    The addition of acid into a sample solution often enhances the protonated molecule (MH+) sensitivity in secondary ion mass spectrometry and fast atom bombardment mass spectrometry. In the present study, acid was supplied as an acid vapor sprayed over a sample surface from the tip of a capillary. The spray was easy to control from outside of the ion chamber in the course of the experiment. Intense ion signals of MH+ were found to last longer with this spraying method, which caused more improvement in sensitivity than in the case of conventional mixing method. The degree of sensitivity enhancement was found to be virtually independent of the concentration of the acid.
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