Stuttgart 2012 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
A: Fachverband Atomphysik
A 28: Poster: Interaction of matter with ions
A 28.6: Poster
Wednesday, March 14, 2012, 16:30–19:00, Poster.V
An asymptotically corrected two-centre potential for the description of He+- He collisions — •Gerald Schenk1, Tom Kirchner1, and Hans-Jürgen Lüdde2 — 1Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, Canada — 2Institut für Theoretische Physik, Goethe Universität Frankfurt, Germany
The Basis Generator Method (BGM) was developed to calculate ionization and electron transfer probabilities in ion-atom collisions [1]. In its two-centre (TC) implementation electrons from both collision centres can be propagated in a single potential, based on the Independent Particle Model. However, this leads to a complication. Looking at the asymptotic behaviour of the potential towards large internuclear distances it becomes apparent, that a combination of (screened) atomic potentials can not be asymptotically correct for both centres simultaneously. Either a potential correct for the target or for the projectile electron can be chosen.
An approach to avoid this is to use a potential that locally shows the correct asymptotic behaviour for both collision centres by combining both cases through a minimum function. First results obtained from TC-BGM calculations with such a potential will be presented for He+-He collisions at intermediate impact energies.
[1] M Zapukhlyak et al 2005 J. Phys. B: 38 2353