Journal of the Mass Spectrometry Society of Japan

Multiple-dispersion Mass Spectrometer(I)Apparatus and Improvement in Resolving Power

NOZOMU MORITO, ITIRO OMURA, TAMOTU NODA

1962 Volume 10 Issue 20 Pages 6-12
Published: June 30, 1962
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.10.6

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This paper describes the characteristics of a multiple-dispersion mass spectrometer. In the simplest case(i. e. double dispersion), ion beam from the ion source is dispersed in magnetic field, let to the ion mirror and driven back to magnetic field, dispersed again, and received by the ion collector.Resolving power is approximately doubled by the double dispersion method.

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Industrial Mass Spectrometer

HIROHIKO EZOE, TOMONAO HAYASHI, KAZUTOSHI NAGAI

1962 Volume 10 Issue 20 Pages 13-20
Published: June 30, 1962
Released on J-STAGE: July 05, 2011

DOIhttps://doi.org/10.5702/massspec1953.10.13

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The electronic unit of a conventional dual-collector mass spectrometer is modified so as to measure relative ion currents even when their mass difference is considerably large. In the present device, two square-wave voltage pulses are successively impressed on the ion source to accelerate ion beams alternatively and collect them on each collector, and after amplified respectively by a. c. amplifier their outputs are balanced out by means of precision attenuators, which may then indicate the ratio of the two ion currents immediately. The essential circuit diagrams and experimental results are given which show the device to be useful for industrial purposes.

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Power Supply for Ion Source of Mass Spectrometer in Electrotechnical Laboratory

KOGORO MAEDA, TAKASHI KAWASHIMA

1962 Volume 10 Issue 20 Pages 21-28
Published: June 30, 1962
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.10.21

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This paper describes the design and the construction of power supply for the ion source of mass spectrometer in Electrotechnical Laboratory. The power supply consists of following four parts: d. c. high voltage source for ion focusing and acceleration(0.3-10KV), stabilizing and accelerating circuits for bombarding electron(0-150V), controlling and measuring system ion source temperature(150'C-300T), and exciting supply for ion source magnet(0-2A). Several special designs are adopted for above four parts so as to keep the stabilities of the order of 10-4?10-5which is enough for the ion source of mass spectrometer. Tests on these supplies showed that long time stability of10-4/hr and ripple voltage of20mV were obtained as for the high voltage supply over the range of1-10KV. Some results of the tests on other parts were described.

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Mass Spectrometric Measurements of Negative Ions

ITIRO OMURA, NOZOMU MORITO

1962 Volume 10 Issue 20 Pages 29-33
Published: June 30, 1962
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.10.29

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A double-dispersion mass spectrometer can be successfully used for observation of negative ions. Positive ions are led to an ion collector, and by changing the polarity of ion accelerating voltage, negative ions are led to another ion collector at the opposite side. It is unnecesary to change the polarity of magnetic field. Negative ions(O-)from oxygen and carbon monoxide electron impact were observed, and appearance potentials were measured.

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Formation of Nitric Oxide at the Preparation of Nitrogen Gas for Mass Spectrometric Analysis

Mituko Kobayakawa, SHIGENARI HAYASHI, TOSHIZO TITANI

1962 Volume 10 Issue 20 Pages 34-36
Published: June 30, 1962
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.10.34

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The influence of experimental conditions on the formation of nitric oxide at the preparation nitrogen gas for mass spectrometric analysis by the oxidation of ammonium salt with hypobro mide was studied. The amount of nitric oxide produced during the oxidation process correlated neither to the amount of hypobromide nor to the concentration of ammonium salt.It was found further that the reaction temperature had no marked effect on the formation of nitric oxide. The reproducibility of analysis of nitrogen from oxidation of ammonium chloride solutions was within about ±0.5%, and this value agreed with the statistical error of isotopic abundance measurements nitrogen by the mass spectrometer.

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On the Double Oven Method of Mass Spectrometer for Relative Partial Pressure Measurements

MINORU TSUDA

1962 Volume 10 Issue 20 Pages 37-41
Published: June 30, 1962
Released on J-STAGE: March 01, 2011

DOIhttps://doi.org/10.5702/massspec1953.10.37

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The frit-type double oven method of mass spectrometer has been solved for molecular gas flow. The fragmentation coefficient and relative partial pressure are calculated for the monomer and dimer of alkali halides in the single component system. Simple formula for experiment is derived to determine relative partial pressure of monomer and dimer. In case of existence of monomer, dimer and trimer, relative partial pressures are also calculated.

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Measurements of Isotope Ratio by Mass Spectrometry(II)

Measurements of Isotope Abundance Ratio of Oxygen

TOSHIZO TITANI, MITUKO KOBAYAKAWA

1962 Volume 10 Issue 20 Pages 42-48
Published: June 30, 1962
Released on J-STAGE: June 28, 2010

DOIhttps://doi.org/10.5702/massspec1953.10.42

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