分析のやつかいな炭化水素の分析においても十分安定に高性能を発揮し得るRMU-5型質量分析計をあらたに設計製作したが, 十分にその目的を達し得た理由の一つとして, 真空系に対する配慮を十分に施したことが挙げられる。本報告においてはまず質量分析計の真空条件について簡単に論じ, 次にこの主旨にそつて設計したRMU-5型質量分析計の主排気系の各部について述べ, 最後に若干の実験結果を報告する。特に, 高速度排気によつて約2時間で10^-7mmHgの桁に入り, 分析中でも10^-7mmHgの桁を保ち, トラツプ冷却剤の放置寿命が24時間にも達したことは予期以上であつた。

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In the beginning of this short survey, the quantitative values of the threshold energies and the sputtering yields under normally incident bombardment by low energy Hg⁺ ions are collected for various metals, without referring to their mechanisms in detail. From these data, the threshold energies have been estimated by Wehner and the measure of the sputtering yields by author for the case of rare gas ions, assuming that the momentum transfer mechanism is applicable for sputtering by low energy ions. The result are also included.
In the case of high energy ions, the sputtering yields under rare gas ion bombardments are calculated for Ag from the equation which is derived by Keywell basing upon a consideration analogous to the neutron cooling process in modulator, but the calculated curves do not fit to the experimental once. It suggest that there is no theoretical expression which can predict the yield value quantitatively.
At last, the depth of penetration of an ion into metal and the changes in apparent sputtering yield with increases in gas pressure are also described briefly.

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