Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 14: Ion Scattering II (with molecules and surfaces)
A 14.10: Vortrag
Donnerstag, 5. April 2001, 18:00–18:15, H1028
Backscattering of slow highly charged ions at alkali halide surfaces: suppression of the trampoline effect — •Ludger Wirtz1, Christoph Lemell1, Carlos O. Reinhold2, and Joachim Burgdörfer1 — 1Institute for Theoretical Physics, Vienna University of Technology, Austria — 2Oak Ridge National Laboratory, USA
We present a simulation of the ionic and charge-transfer dynamics of a slow multiply charged ion in vertical incidence on an alkali halide surface. Since the frequently used ZBL-potential overestimates the repulsive potential at energies in the eV range we use a Hartree-Fock method to calculate binary interaction potentials. We perform simulations of projectile trajectories including the lattice dynamics of the surface. The neutralization sequence on the incoming trajectory is based on electron transfer rates calculated by a Classical Trajectory Monte Carlo simulation. We show that backscattering above the surface due to the local positive charge up of the insulating surface (“trampoline effect”) does not take place. Instead, the ion penetrates into the surface or is reflected due to close binary collisions with surface ions.