Abstract
A method for obtaining excitation functions in digital form is described which is applicable to measurements of ion appearance potentials by electron impact in mass spectrometry. The method employs a sampling time-to-pulse height converter and synchronously pulsed operational amplifier. Excitation functions for the ions O + and C + produced by electron impact on a CO 2 gas beam are presented. An appearance potential of 19.4±0.3 eV was obtained for O +, probably corresponding to the threshold for excitation of the predissociation C 2Σ g + state of CO 2 +. The observed C + onset of 29.8±0.3 eV corresponds to total dissociation of the CO 2 molecule by the process e+CO 2 → C + + O+O+2 e.
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