応用物理
Online ISSN : 2188-2290
Print ISSN : 0369-8009
出現電圧測定用質量分析計
鹿又 一郎金子 洋三郎小栗 多計夫
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1961 年 30 巻 7 号 p. 502-508

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A mass spectrometer for study on appearance potential is assembled. R. P, D. method is used for ion source of this mass spectrometer so that ionization may essentially be effected by monoenergetic electron beam. An adequate operating condition is found by a study on characteristics of the ion source. The efficiency of this ion source for difference ion current is three times as good as that obtained by other workers.
A secondary electron multiplier is made by way of experiment as an ion current detector. This is an Inghram type and consists of dinodes of Ag-Mg (Mg 1.7%), which are activated in oxigen gas of 1×10-3mm Hg for ten minutes at 500°C. The total gain is 5×105 for total voltage of 4.5 kV, and the noise level at no-signal is found to be 2×10-17A. By the use of this multiplier, sensitivity of the spectrometer increased to approximately a hundred times as good as that obtained by a conventional D. C. amplifier.
The appearance potential of nitrogen moleculer ion measured with this mass spectrometer is almost in agreement with spectroscopic value. In addition, structures of the ionization curve that cannot be observed by the ordinary method are also observed.

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