Abstract
He+ ions incident on a metal surface can neutralize either by an Auger or resonant charge exchange. While the Auger process has always been thought to be dominant, recent theoretical interest in the simpler one-electron resonance process has led to suggestions that this alone can account for the neutralization seen in low energy He+ ion scattering. In this paper this assertion is analysed by looking at the wider information available on charge exchange processes for He+ ion scattering through comparison with Li+ ion scattering, the importance of multiple scattering in both these scattering experiments and the results of ion neutralization spectroscopy. These lead to the conclusion that while resonance neutralization to produce metastable He∗ may well occur at a substantial rate in He+ ion scattering, the dominant process leading to loss of ions from the final scattered signal is Auger neutralization as originally proposed.
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