Multiple-scattering effects in ion-surface interactions at low energies

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Abstract
The scattering of 600-eV He ions from clean Ni(110) is studied both experimentally and by means of computer simulation. It is shown that for a comparison with the experimental data it is essential that the scattering model be three dimensional. We infer from such comparisons for the dependence of the ion yields on the crystallographic orientation that neutralization effects are operating which strongly depend on the scattered particles' trajectories. Two types of neutralization processes are distinguished: one essentially Auger and the other more typical of the bulk neutralization seen at higher energies.