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O: Fachverband Oberflächenphysik
O 46: Electron-Driven Processes at Surfaces and Interfaces
O 46.1: Talk
Wednesday, March 29, 2023, 10:30–10:45, CHE 91
On the energy transfer mechanism in hyperthermal H atom scattering from surfaces — •Nils Hertl1, Connor L. Box1, and Reinhard J. Maurer1, 2 — 1Department of Chemistry, University of Warwick, UK — 2Department of Physics, University of Warwick, UK
Adsorption of atomic and molecular hydrogen on surfaces is the gateway to many important chemical processes in nature. Hence, it is important to understand their adsorption mechanism if we want to understand the relevant elementary processes of these adsorbates on surfaces.
In the recent years, a series of detailed theoretical and experimental investigations of energy transfer between H atoms and a variety of material surfaces have been performed. The investigated substrates range from noble gas surfaces with a detour to semiconductors to late fcc transition metal surfaces. Transition metal surfaces with adsorbates were investigated, too. For all studies, a UHV apparatus, specifically designed for H atom scattering, has been used. The complementary theory relies on molecular dynamics simulation, where electronic excitations are described within the framework of molecular dynamics with electronic friction. The friction coefficient is treated within the local density friction approximation (LDFA).
In this talk, I will briefly revisit those studies and on the basis of them, I will formulate a couple of general concepts relevant to atom scattering from surfaces. Furthermore, I will also present first efforts to apply methods which go beyond the framework of LDFA friction for hyperthermal H atom scattering.