Charge neutralization of He+ ion beams

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Abstract
Total charge transfer cross sections for neutralization of He+ ion beams have been measured for 1.0–3.0 keV ions. Time‐of‐flight methods have been used to identify the forward scattered He0 products from He+ interactions with Ar, H2, N2, O2, NO, CO, CO2, CH4, C2H4 and C2H6 targets. Both elastic and inelastic processes were included in the measurement of fast He0 products. Total charge transfer cross sections are typically 5–15 Å2 for most of the target gases with the exception of H2 where cross sections are smaller. In the few cases where overlap exists, cross sections measured in the present investigation are in general agreement with previous measurements that have used apparatus designed to collect slow product ions with high efficiency.