Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Plasma Wall Interaction

P 14.2: Poster

Dienstag, 14. März 2017, 16:30–18:30, HS Foyer

A molecular dynamics modeling of electron emission from metal surfaces induced by gas-surface interactions — •Alexey Filinov^1,2,3, Michael Bonitz¹, and Detlef Loffhagen² — ¹Institut für Theoretische Physik und Astrophysik, CAU Kiel, Leibnizstr. 15, D-24098 Kiel, Germany — ²INP Greifswald e.V., Felix-Hausdorff-Straße 2, 17489 Greifswald, Germany — ³Joint Institute for High Temperatures RAS, Izhorskaya Str. 13, 125412 Moscow, Russia

The interaction of a dilute monatomic gas with a solid surface is investigated by Molecular Dynamics (MD) simulations. The main goal is to provide a microscopic description of the electronic stopping-power effects and secondary electron emission. The gas-surface interaction (for Ar atoms and ions) is treated via the effective pair potential determined from the non-local van-der-Waals approach [1]. Different energy dissipation channels in the adsorption process are included. The electron-hole pair excitations are considered via the model of electronic friction [2]. The phonon excitations are treated via the Langevin MD simulations. We analyze how the electron emission current depends on the effective electron temperature (determined by the energy losses) and the work function of a metal modified by a surface electric field and positive ions slowly moving at atomic distances to the surface.

[1] R. Grenier et. al., J. Chem. Phys. A 119, 6897 (2015). [2] J.I. Juaristi et. al., Phys. Rev. Lett. 82, 1048 (1999).