Mass-Spectrometer Investigation of Electron-Impact Processes at Pressures to 1 mm Hg

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Abstract
A mass spectrometer for the study of secondary reactions involving ions, excited species, and molecules is described. The instrument was checked with the Hornbeck—Molnar process for He2+ formation in He, O3+, and O4+ formation in O2 and N3+, and N4+ formation in N2. Source pressures to about 1 mm Hg are used. The electron beam is controlled by the retarding potential-difference technique for reducing the effective width in energy of the electron distribution.