title: Localized description of surface energy gap effects in the resonant charge exchange between atoms and surfaces.
abstract: The resonant charge exchange between atoms and surfaces is described by considering a localized atomistic view of the solid within the Anderson model. The presence of a surface energy gap is treated within a simplified tight-binding model of the solid, and a proper calculation of the Hamiltonian terms based on a LCAO expansion of the solid eigenstates is performed. It is found that interference terms jointly with a surface projected gap maximum at the Γ point and the Fermi level inside it, lead to hybridization widths negligible around the Fermi level. This result can explain experimental observations related to long-lived adsorbate states and anomalous neutral fractions of low energy ions in alkali/Cu(111) systems.
authors.affiliation: Instituto de Desarrollo Tecnológico para la Industria Química (INTEC-CONICET-UNL), Güemes 3450, CC91, (S3000GLN) Santa Fe, Argentina. aiglesiasg@santafe-conicet.gov.ar
authors.forename: A
authors.initials: A
authors.lastname: Iglesias-García
authors.forename: Evelina A
authors.initials: EA
authors.lastname: García
authors.forename: E C
authors.initials: EC
authors.lastname: Goldberg