Landolt-Börnstein - Group III Condensed Matter

7.1.2.4.1 The static repulsive potential

Abstract

This chapter describes theory of the elastic atom-surface potential. It is common practice to divide the atom-surface interaction into an attractive part due to van der Waals forces and a repulsive part due to the overlap of the surface wave functions with the closed-shell He orbitals. The theory has been developed for the static repulsive potential, but the results can be taken over directly to the dynamic interaction, within the usual Born-Oppenheimer approximation. A different approach starts with the helium (He) atom well outside the surface and treats it as a perturbation on the surface electrons (e). This approach was successfully used to predict the laterally averaged interaction with metal surfaces. The interaction between the He atom and the electron is represented by the pseudopotential. The e-He scattering data must be continued to negative energies of a few eV, because the surface electrons are bound. For insulators, approximation can be started directly from pairwise repulsive interactions between the He atom and the surface constituents.

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Title
7.1.2.4.1 The static repulsive potential
Book Title
Interaction of Charged Particles and Atoms with Surfaces
In
7.1.2.4 Theory of the elastic atom-surface potential
Book DOI
10.1007/b87125
Chapter DOI
10.1007/10086066_56
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
24C
Editors
  • G. Chiarotti
  • Authors
  • V. Celli
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