Abstract
The features of alkali low energy ion scattering (ISS) in the impact collision mode (ICISS) have been investigated by scattering of 2000 eV Na + at a clean, non-reconstructed surface, Pt(111). The measured ICISS patterns show sharp intensity maxima at the positions expected from the surface geometry on the basis of strong focussing of the scattered ions via shadowing and blocking effects. The self calibration procedure based on the experimental determination of an effective shadow cone is an important advantage and results in a simple calculation scheme for the locations of intensity slopes in the ICISS patterns. The alkali ion ICISS shows a way to overcome the dilemma of neutralization effects known in noble gas ISS, as well as the complexity of alkali ISS in forward direction due to multiple scattering.
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