Abstract
Charge-inversion spectra have been recorded for beams of C+, O+, S+ and Cl+ ions from CO, O2, CS2 and HCl respectively, incident onto target gases of Xe, Kr and NO, and the relative currents of anions from selected double-collision reactions of ground-state ions have been used to determine the proportions of such ions in the beams formed from the above precursors ionized using 100 eV electrons. The proportions of ground-state ions were found to be as follows: C+(2P)=0.71+or-0.06; O+(4S)=0.41+or-0.05; S+(4S)=0.60+or-0.07; Cl+(3P)=0.56+or-0.05. The non-ground-state ions in beams of O+, S+ and Cl+ were found to be distributed between two states and approximate distribution ratios are given.
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