Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: New Methods and Developments III: Spectroscopy and Tribology

O 34.7: Vortrag

Dienstag, 2. April 2019, 15:30–15:45, H13

New reconstruction method for Metastable Induced Electron Spectra of molecules on solid surfaces — •Tobias B. Gäbler, Wichard J. D. Beenken, and Erich Runge — Technische Universität Ilmenau, Institute for Physics, Ilmenau, Germany

The Metastable Induced Electron Spectroscopy (MIES) allows an extremely sensitive electronical characterization of liquid and solid surfaces by deexcitation of metastable rare gas atoms. We present ab initio calculations of MIES spectra of molecules physisorbed on solid surfaces. For this purpose, we calculate spatially distributed transition rates of the Auger deexcitation process without the simplifying assumptions as proposed by Kantorovich et al. [1]. Thereby, we model the density of metastable Helium atoms along a series of trajectories approaching the sample molecule. According to experimental results for benzene [2], our calculations demonstrate - in contrast to the approach of Kantorovich et al. [1] - an anisotropy of the MIES spectra in respect not only to the molecule orientation but also to the electron detection direction. Thus, due to the ajustable direction of the incidence of metastable helium and of the detection of emitted Auger-electrons in the simulation, our method is able to forecast MIES spectra for arbitrary experimental setups.

[1] L.N. Kantorovich, A.L. Shluger, P.V. Sushko, A.M. Stoneham, Surf. Sci. 444 (2000) 31-51

[2] J. Günster, G. Liu, V. Kempter, D.W. Goodman, Surf. Sci. 415 (1998) 303-311