Landolt-Börnstein - Group III Condensed Matter The scattering potential in LEED


This chapter discusses a scattering potential in LEED. One of the most important ingredients in the calculations is the scattering potential. Ultimately, structural parameter accuracies depend on the availability of adequate scattering potentials. Due to the assumed spherical symmetry of an atomic potential, which is inherent to a muffin-tin picture, the scattering potential enters low-energy electron diffraction (LEED) calculations through the phase shifts, which are calculated using appropriate computer programs performing the numerical integration of a radial component of a Schrodinger equation. The most delicate part of this calculation is the evaluation of the exchange and correlation terms. This is in principle a non-local potential, which is in general approximated by a local one for the sake of simplicity. A non-structural parameter entering the calculations is an inner potential. In general it is assumed that small variations of the inner potential do not change the shape of the intensity curves. It is less evident how the variation of the inner potential in the surface layers has to be taken into account. In general, the electron spin is not considered, at least in the case of light scatterers. However, for high atomic number scatterers relativistic effects and the spin interaction become important and have to be taken into account. The effect can be summarized in effective phase shifts, averaged from the spin up and spin down phase shifts, and using a non relativistic theory.

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Title The scattering potential in LEED
Book Title
Interaction of Charged Particles and Atoms with Surfaces
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Landolt-Börnstein - Group III Condensed Matter
  • G. Chiarotti
  • Authors
  • E. Zanazzi
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