Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.20: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
The over-the-barrier model for electron transfer between metallic spherical clusters — •Henning Zettergren1, Henning Schmidt1, Seguiro Tomita2, Preben Hvelplund2, Henning Lebius3, Bernd Huber3, and Henrik Cederquist1 — 1Frecativägen 24, S-104 05 Stockholm, Sweden — 2Institute for Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark — 3Departement de Recherche Fondamentale sur la Matiere Condensee, S12A, IMC CEA-Grenoble, 17 rue de Martyrs, F-38054 Grenoble-Cedex 9, France
We present a new classical over-the-barrier model for electron transfer between two isolated, infinitely conducting, spheres with arbitrary and different electrical charges. The sphere radii can be chosen freely from macroscopic to atomic dimensions. With both radii set to 7.2 a0 we make comparisons with recent measurements of charge-state distributions following slow non-fragmenting C60q+-C60 collisions [1]. By letting one of the sphere radii approach zero we arrive at the over-the-barrier model for electron transfer between atomic ions and (spherical) clusters (see e.g. [2]). When both radii are of the order of one atomic unit, or smaller, we reproduce the results of the corresponding, well-known, models for electron capture from atoms to highly charged atomic ions. 1mm [1] H. Cederquist et al. Phys. Rev. A 63, 0252xx-1 (2001). 1mm [2] H. Cederquist et al., Phys. Rev. A 61, 022712 (2000).