Interaction effects in Helium Atom Scattering from semimetal Surfaces
Patrick Kraus
Institute of Experimental Physics
13:20 - 14:00 Thursday 24 October 2013 AT02002J Helium Atom Scattering (HAS) is used for the investigation of surfaces because of its property of being strictly surface sensitive. Elastic and inelastic HAS experiments reveal facts about the periodicity and the corrugation of the surface structure as well as the surface phonon dispersion.
Atop of the usually acquired information on surface structure and phononic dispersion, HAS measurements reveal detailed information about the interaction potential between the single helium atom and the interacting surface. While usually restricted to small variations in the inelastic background, the effects arising from this interaction can be used to magnify desired features in certain measurements. Furthermore, the detailed knowledge of the interaction potential enables the investigation of the surface structure with exact quantum mechanical tools.
While being beneficial for such cases, these bound state resonance effects can tamper with more complex forms of data analysis, like the estimation of the mode-selected electron-phonon interaction parameter.
In addition to HAS measurements from Bi(111) and Sb(111), detailed examples for the benefits and drawbacks of the particle-surface interaction will be presented.
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