Abstract
The Li + ion neutralisation by back-scattering from an Al(100) surface partially covered by alkali adsorbates is theoretically studied, using a previously developed model representation of the Li + ion–alkali adsorbate–Al substrate system [A.G. Borisov, G.E. Makhmetov, D. Teillet-Billy, J.P. Gauyacq, Surf. Sci. 350 (1996) L205]. Three alkali adsorbates are studied: Na, K and Cs and the differences between their effects are discussed. In the back-scattering geometry, the neutralisation probability is found to be quite different for lithium bouncing from the alkali adsorbate or from the Al substrate; it is also different for the various alkali adsorbates. The present results are found to be in quantitative agreement with the recent experimental data of Weare and Yarmoff [C.B. Weare, J.A. Yarmoff, Surf. Sci. 348 (1996) 359]. These results confirm the importance of the local variation of the charge transfer process on the surface, as well as the capability of the charge transfer process to probe the local electronic potentials. A large probability for Li(2p) excited atom formation by collision on the adsorbate sites is also found in the present study, even in the limit of very low alkali coverages.
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