Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.29: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Energy loss of highly charged ions in microcapillary transmission — •Károly Tőkési1, Xiao-Min Tong2, Christoph Lemell1, and Joachim Burgdörfer1 — 1Institute for Theoretical Physics, Vienna University of Technology Wiedner Hauptstr. 8-10, A-1040 Vienna, Austria — 2Cold Trapped Ions Project, ICROP, JST, Axis 3F, 1-40-2 Fuda Chofu, Tokyo 182-0024, Japan
We will present time-dependent density functional calculations for the energy loss of highly charged ions undergoing grazing interaction with the walls of microcapillaries. The ions approach the walls close enough to suffer a significant amount of energy loss without, however, experiencing charge exchange. Electron-electron correlation is taken into account within the linear response theory. We perform the simulations for a metallic microcapillary of Al and Ne10+, Ar18+ and Kr36+ projectiles. The amount of energy loss is correlated to the distance of closest approach which determines the strength of the interaction between the projectile and the solid surface. Since the scattering angle and the distance of closest approach are strongly correlated, the distance-dependent stopping power and thereby the surface dielectric properties of the capillary material at large distances can be probed in detail. This work was supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung (P12470-TPH).