Abstract
Low energy (2000 eV) ion scattering spectroscopy in the impact collision mode has been carried out in three modes: primary noble gas ions and detection of ions only (usual ICISS), detection of both ions and neutrals (NICISS) and use of primary alkali ions (ALICISS). The three modes have been compared by in situ measurements at a Pt(111) surface. Usual ICISS suffers from the high neutralization probability of the ions during scattering. This has a hardly predictable influence on the scattering patterns and limits the sensitivity to the first layer. In addition it asks for large primary ion doses which impair the state of the surface. In the case of ALICISS the neutralization is substantially reduced, while in NICISS it plays no role. These two ICISS modes supply a picture of the relative positions of the atom cores in real space making them ideally suited for the determination of surface reconstruction or relaxation.
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