Regensburg 2000 – scientific programme

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O: Oberflächenphysik

O 20: Elektronische Struktur (II)

O 20.3: Talk

Tuesday, March 28, 2000, 16:45–17:00, H37

Electronic collisions in finite and extended systems — •Natasha Fominykh und Jamal Berakdar — Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale)

The collision cross section of a charged particle in a few-body Coulomb system is dominated by processes involving small momentum transfer. This is due to the special functional dependence of the Coulomb potential which have a diverging form factor at zero momentum transfer. For scattering reactions from a many-electron system the situation is distinctively different. Here the collective response of the system to an external perturbation is the decisive quantity. In this talk we discuss differences and common features between electronic collisions within a few-body and extended electronic systems. The ideas are illustrated by numerical results on charged particle scattering from atomic systems and surfaces.