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A: Fachverband Atomphysik
A 14: Posters: Interaction of matter with ions
A 14.12: Poster
Dienstag, 11. März 2008, 16:30–18:30, Poster C3
Electron emission from insulators irradiated by slow highly charged ions — •Martin C. Simon1,2, Walter Meissl1, Daniel Winklehner1, Rainer Ginzel2, José R. Crespo López-Urrutia2, Joachim Ullrich2, and Friedrich Aumayr1 — 1Institut für Allgemeine Physik, Vienna University of Technology, Wiedner Hauptstraße 8-10/134, A-1040 Vienna, Austria — 2Max-Planck Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
Electron emission induced by impact of slow highly charged ions (HCI) on metallic surfaces has been studied extensively over the past 15 years. The "classical-over-the-barrier" (COB) model was very successful in modeling the formation of so-called "hollow atoms" in front of the surface and the subsequent emission of electrons. For insulator surfaces the response to slow HCI impact is not as well understood due to the finite hole mobility and differences in image charge potentials. We measured total electron yields from insulating LiF(001) and CaF2(111) surfaces bombarded by slow (v < 1 a.u.) projectile ions of charge states up to 68+ for various impact angles.
In contrast to metallic surfaces the kinetic electron emission from the insulating surfaces can not be neglected. We present ways to subtract the kinetic emission part and to determine the pure potential electron emission contribution, finding a drastically different behavior for the potential electron emission from insulators as compared to metallic surfaces.
This work has been supported by: Austrian FWF (Proj. No. P17449-N02), European Project RII3 026015, Association EURATOM-ÖAW.