Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.13: Poster

Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F

Interaction of slow highly charged ions with surfaces — •Christian Haake, Thorsten Peters, Andreas Wucher, and Marika Schleberger — Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany

A new ion beam installation has been built to investigate the mechanisms of energy dissipation in a substrate after the impact of highly charged ions. First experiments at the TU Wien made successful use of metal-insulator-metal (MIM) junctions to measure electronic excitations in the irradiated metal [1]. These MIM-junctions offer the unique possibility to detect excitations below the work function which limits the external emission of electrons. In order to separate effects induced by either the kinetic or the potential energy of the projectile, both contributions need to be controlled independently. In the Vienna experiment the ions had medium charge states of q=1 up to to q=8 and kinetic energies of 400 eV to 12 keV. The new set-up offers higher charge states and is designed for kinetic energies of less than 100 eV/q. This will enable us to produce extremely slow highly charged ions. In addition, external electron emission as well as secondary and neutral mass spectrometry (SIMS/SNMS) will be used to follow the external pathways of energy dissipation.

[1] T. Peters, C. Haake, D. Diesing, D. Kovacs, A. Golczewski, G. Kowarik, F. Aumayr, A. Wucher and M. Schleberger, Hot electrons created by (rather) cold ions, submitted to Phys. Rev. Lett.