Theoretical investigation of the ion-induced polarization charge influence on resonant charge transferстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 ноября 2019 г.
Аннотация:This work addresses the modeling of the resonant neutralization of positive alkali-metal ions near metal surfaces. Usually the charge, induced by a positive ion, is taken into account by means of point image charge, located symmetrically to the image plane. Such an approach describes the ion level shift near the metal surfaces and gives reasonable values of the alkali-metal ion neutralization probability on the surfaces with a projected band gap, e.g., Au(111), Cu(111), and Ag(111). In this paper, we show that the induced charge is better described by means of a negatively charged plane located near the surface. This charged plane forms a potential barrier, the inclusion of which in the numerical model significantly reduces the calculated electron transfer probability and allows us to reach quantitative agreement with experimental data for free-electron surfaces, e.g., Cu(110). This repulsive potential barrier generates ion-induced states, by means of which the resonant neutralization of positive alkali-metal ions on free-electron surfaces occurs. Ion-induced states are not so important for surfaces with a projected band gap, because in this case ion neutralization occurs via well-known surface states.