Mass Spectrum of Residual Gases in High Vacuum Observed with a High Resolving Power Mass Spectrometer

概要

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Resolving power of the mass spectrometer (constructed for micro-analysis in Osaka University) was increased up to about700 and the mass spectra of residual gases at the pressure of 2. 5× 10-8 mmHg were observed in the mass range from 12 to 46. Numbers of doublets or multiplets were found in the mass spectra and each peak was assigned to an appropriate ionic specy considering its mass and peak height. It was found that oxygenated hydrocarbons and chlorine or hydrochloric acid were existent. The peak shapes of CH4+, C+ and H+ were somewhat different from others, which may due to the excess of the initial energies. Owing to the increased resolving power, it became possible to separate rare gas peaks from hydrocarbon peaks under dynamic or static operation, which was useful for the micro-analysis of rare gases.
日本質量分析学会の論文