Stopping of slow ions in the electron selvedge of a metal surface
Institut für Physik der Humboldt-Universität zu Berlin
Invalidenstr. 110, D-10115 Berlin, Germany
Accepted: 17 December 1997
From studies on the energy loss of fast atomic projectiles () ranging from protons to potassium ions in the scattering from a clean and flat Al(111)-surface under a grazing angle of incidence, we derive stopping powers as a function of distance from the surface plane. We observe that oscillations for the stopping powers with atomic number Z1 show a pronounced dependence on the electron density as predicted by nonlinear density-functional calculations. For sufficiently low electron densities, those oscillations follow the intuitive picture in showing minima of stopping for projectiles with noble-gas configurations.
PACS: 79.20.Rf – Atomic, molecular, and ion beam impact and interactions with surfaces / 34.50.Bw – Energy loss and stopping power
© EDP Sciences, 1998