Abstract
The distribution of the number of emitted electrons is measured for the impact of He + and He 2+ ions on Al, Cu and Au targets. The ion energy is between 0.6 MeV (He +) and 4.8 MeV (He 2+). The obtained results are very well represented by Polya distributions and the parameters of the fitted distributions are given. The measured distributions for He + impact are explained by a model which takes into account stripping of the bound electron. It is found that the mean depth, where He + ions penetrate the solid without losing their bound electron, is about 10 Å and it decreases with increasing projectile energy. These results, obtained from measurements of the emission statistics, are also compared with results obtained from yield measurements.
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