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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 C₆₀^q+-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).