Journal of the Mass Spectrometry Society of Japan

Design of Second Order Double Focusing Mass Spectrometers

HIROHIKO EZOE, TOMNAO HAYASHI, TAKASHI SHIKATA, KATSUSUKE YAMANE, YOSH ...

1963 Volume 11 Issue 23 Pages 83-88
Published: December 25, 1963
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.11.83

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Analytical results given by Hintenberger are studied numerically with an electronic computer, and physically realizable solutions are computed systematically in detail. Corresponding to these solutions the inclinations and the radii of curvature of the first order focusing loci are computed also and the design data are tabulated.On two examples of these instruments the aberrations caused by dimensional errors are also estimated.

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Magnetron Type Mass Spectrometer

SHIGERU NAKAGAWA

1963 Volume 11 Issue 23 Pages 89-93
Published: December 25, 1963
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.11.89

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A small and simple mass spectrometer was constructed which utilized the magnetron characteristics of cutting off the ion currents successively according to their masses by scanning the magnetic field, and the isotopic contents of lithium were analyzed using the center filament as a surface ionization source. By superimposing a small a. c. voltage on a constant accelerating voltage, stepped ion currents collected on the outer cylindrical electrode were modified and a conventional mass spectrum was recorded.

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Electron Bombardment Ion Source for a Mass Spectrometer

SABURO MAGARI, KOKICHI HOTTA

1963 Volume 11 Issue 23 Pages 94-99
Published: December 25, 1963
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.11.94

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Dependence of an auxiliary magnetic field in the region of the ion source, that of spreading of the electron beam and that of geometrical position of electron path in the ionization chamber upon ion currents has been studied. It leads to the following conclusions. Source magnet minimizes the spreading of the electron beam but does not improve the gain essentially. Ion currents may be increased if the source magnet deflects the electron beam to the first ion slit. Source magnet is unnecessary when the electron beam is focused by a filament shield. It is found that more stable operating conditions can be obtained without an auxiliary magnetic field in the region of the ion source when the electron beam passes through as near the first ion accelerating slit as possible and the rate of ion production is not proportional to the cross-section of the electron beam.

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Fragment Ions with Excess Kinetic Energy Produced by Electron Impact.

Part 1. Methods of Measurements and m/e Ions from 1, 3-Butadiene

TOSHIKAZU TSUCHIYA

1963 Volume 11 Issue 23 Pages 100-105
Published: December 25, 1963
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.11.100

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Lithium Isotope Separation on Complex Formation I. Equilibrium Study

SHIGERU YAMASHITA, TERUO HAYAKAWA

1963 Volume 11 Issue 23 Pages 106-111
Published: December 25, 1963
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.11.106

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Lithium isotope separation on molecular complex formation has been studied in lithium chloride- 1, 4-dioxane systems. The complex shows an absorption maximum at 270 mμ, and the molar ratio LiCl/dioxane in the complex has been found to be 1:1. The isotope ratio has been determined by a mass spectrometer using a surface ionization ion source. The results show that Li is enriched in the complex and the single stage separation factor is 1.026 in equilibrium at 100 °C. The separation of lithium isotopes seems to occur during the isotope exchange reaction between LiCl-dioxane complex and uncomplexed LiCl.

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On the Measurement of the Isotope Ratio of Potassium.

TAKUJI KOMORI, SHUZO TAMURA

1963 Volume 11 Issue 23 Pages 112-116
Published: December 25, 1963
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.5702/massspec1953.11.112

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A mass-spectrometric study has been carried out on the measurements of the isotopic ratio of potassium using a surface ionization ion source.The pretreatment of the sample filaments for removing background potassium was studied using enriched ⁴¹K isotope(96%)on rhenium, tantalum and tungsten filaments. Chloride, nitrate and sulfate of potassium were examined as a sample material for the measurement of isotopic ratios. Time variations of ³⁹K/⁴¹K ratio during one run were observed with potassium chloride and potassium iodide samples and the isotope fractionation effect in the ion source was studied. Among these compounds, potassium iodide was most preferable one as a sample material because of the large ionizing efficiency and of the small isotope fractionation.

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Analysis of Impuities in High Purity Carbon Dioxide

MASAHIKO TSUCHIYA, TAKASHI TACHIKAWA

1963 Volume 11 Issue 23 Pages 117-122
Published: December 25, 1963
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.11.117

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A mass spectrometer for the routine analysis cannot be used directly for the analysis of high purity carbon dioxide. The method for separation of impurities is described in this paper. Impurities, such as argon, nitrogen, oxygen and so on, can be separated from carbon dioxide by using a liquid nitrogen trap and be determined down to 1-0.1 ppm order by mass spectrometer. Both of the pattern coeffcients of peaks at m/e 14 and 32 of high purity carbon dioxide are about 0.02.

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