Abstract
An experimental study is described in which residual gases were analysed by means of a cyclotron resonance mass spectrometer of the omegatron type. Analysis was continuous before, during and after both (a) ion pumping with a Bayard-Alpert pattern hot-cathode gauge and (b) the dispersal of a barium getter. Results are more extensive than any published hitherto and are presented both as mass spectra and the variation of gas constitution with time throughout each stage of the above operations. The study illustrates the potentialities of the omegatron as a tool for solving many problems existing in vacuum technology. In particular, by regarding the Bayard-Alpert pattern gauge as an electron tube, it is shown that the omegatron is well suited to the analysis of residual gases during the manufacture and life of tubes.
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