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For a quantitative evaluation of low-energy ion scattering (LEIS) data with respect to surface composition and structure a detailed analysis of the energy spectra is required. This includes the identification of multiple scattering processes and the determination of ion survival probabilities. The scattered ion energy spectra was analyzed by using the computer code MARLOWE for which a new analysis routine was developed, which allows the recording of energy distributions in dependence of the number of projectile-target atom collisions, in dependence of the distance of closest approach, or in dependence of the scattering crystalline layer. This procedure also permits the determination of ion survival probabilities by applying simple collision-dependent neutralization models. Experimental energy spectra for various projectile (He{+}, Ne{+}, Na{+}) and target (transition metals, oxides) combinations are well reproduced and quantitative results for ion survival probabilities are obtained. These are largely in agreement with results obtained for bimetallic crystal surfaces obtained in a different way. Such MARLOWE calculations are also useful for the identification of structure relevant processes. This is shown exemplarily for the reconstructed Au(1 1 0) surface including a possibility to determine the (1 x 2) to (1 x 1) transition temperature.

Additional information

Authors: BEIKLER R, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);TAGLAUER E, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: An article published in: Nuclear Instruments and Methods in Physic Research B, Vol.182 (2001), pp.180-186
Record Number: 200113880 / Last updated on: 2001-10-09
Original language: en
Available languages: en