Mainz 1997 – wissenschaftliches Programm
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A: Atomphysik
A V: HV V
A V.1: Hauptvortrag
Mittwoch, 5. März 1997, 14:00–14:45, P1
Neutralization and ionization of ions and atoms at metal surfaces — •P. Kürpick1, U. Thumm1, and U. Wille2 — 1J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2604, USA — 2Hahn-Meitner-Institut Berlin, D-14091 Berlin, Germany
We present ab initio calculations on the neutralization and ionization of ions and atoms interacting with a metal surface. Focussing on low-energy collisions, we use the adiabatic self-energy method[1-3] to generate resonance states formed during the interaction of an ion with the metal surface. We obtain accurate, non-perturbative energy shifts and widths of ionic hybrid states over a wide range of ion-surface distances. Furthermore, these states are used as basis functions in a new time-dependent close-coupling calculation to investigate the charge state dependence of the projectile as a function of various parameters such as the initial occupation and velocity of the projectile, and its point of closest approach.
[1] J. Burgdörfer, E. Kupfer, H. Gabriel, Phys. Rev. A 36, 4963 (1987).
[2] P. Kürpick, U. Thumm, Phys. Rev. A 54, 1487 (1996).
[3] P. Kürpick, U. Thumm, U. Wille, (submitted for publication).
Supported by the Deutsche Forschungsgemeinschaft (DFG) through a postdoctoral grant for P.K. and the Division of Chemical Sciences, Basic Energy Sciences, Office of Energy Research, U.S. Department of Energy.