Berlin 2001 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.15: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Quantum mechanical study of ion-atom collisions with many active electrons — •Tom Kirchner1, Marko Horbatsch1, and Hans Jürgen Lüdde2 — 1Department of Physics and Astronomy, York University, Toronto, Ontario, Canada M3J 1P3 — 2Institut für Theoretische Physik, JWG Universität, 60054 Frankfurt, Germany
Total cross sections for single- and multiple-electron capture and ionization events in ion-atom collisions with many active electrons on the target atom are calculated in the independent particle model with the nonperturbative basis generator method. Dynamical screening effects due to the removal of electrons from the target atom and due to the capture of electrons to the projectile ion are taken into account in a global fashion. In this contribution we concentrate on C4+ + Ne collisions at impact energies from 20 to 1000 keV/amu. Our results follow the trends of previous calculations for proton and He2+ impact and the expectation of an established scaling law for the energy dependence of the net electron loss from the target. However, we observe some serious discrepancies with the available experimental cross sections for C4+ and F4+ impact. New experimental investigations of global and charge-state correlated cross sections would be helpful to understand and explain the discrepancies and to assess the validity of the independent particle model in the nonperturbative regime in closer detail.