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A theoretical study of the charge transfer process between a collisional atom and an Al surface partially covered by alkali adsorbates is presented. The non-perturbative Coupled Angular Mode (CAM) method is applied to calculate the static properties of the projectile states. The energies and the widths of the projectile states are strongly modified in the vicinity of the adsorbate compared to the clean surface case. This is attributed to the molecularisation of the atomic and adsorbate levels. The dynamics of the neutralization of Li + ions is studied in the case of backscattering from the Al sites and from the alkali sites on the surface. Large differences in the neutralisation probabilities for Li + scattered from the substrate sites and from the adsorbate sites are obtained. The pecularities of Li - formation in backscattering from alkali adsorbate sites are discussed.
Laboratoire des Collisions Atomiques et Moléculaires (Unité de Recherche associée au CNRS D0281), Bât, 351, Université Paris-Sud91405 Orsay CedexFrance
Laboratoire des Collisions Atomiques et Moléculaires (Unité de Recherche associée au CNRS D0281), Bât, 351, Université Paris-Sud91405 Orsay CedexFrance
Laboratoire des Collisions Atomiques et Moléculaires (Unité de Recherche associée au CNRS D0281), Bât, 351, Université Paris-Sud91405 Orsay CedexFrance