Landolt-Börnstein - Group III Condensed Matter

Interaction of Charged Particles and Atoms with Surfaces · LEED


This chapter describes low-energy electron diffraction (LEED). From the early stages of LEED, the lack of simple kinematic interpretation was established by observing the shape of I/V curves. Some important factors have to be taken into account in order to obtain realistic calculated I/V curves: inner potential, inelastic damping of the electrons and thermal atom vibrations. In general, the scattering potential is considered in the Hartree-Fock framework, i.e. it is assumed that the scattering potential is the attractive nuclear potential and a Coulomb and exchange potential is averaged over the core states. The most important contribution to elastic scattering is in the core potential, due to the nuclei and to the bound electrons. The scattering properties of each atom in the solid are generally represented by appropriate phase shifts. The inner potential has its origin in the surface potential jump undergone by the electrons passing from the vacuum into the solid, and corresponds to the zero of the muffin-tin. The inner potential is in general taken as constant, or as an empirical function which is slightly variable with the energy in the LEED typical range. Inelastic interactions are very important in the low-energy range, and are mainly due to energy loss arising from plasmon excitation. The resulting effect is a general attenuation of the electron beams, thus improving the convergence properties of the calculations.

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Interaction of Charged Particles and Atoms with Surfaces · LEED
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Interaction of Charged Particles and Atoms with Surfaces
In Diffraction theories and methods
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Landolt-Börnstein - Group III Condensed Matter
  • G. Chiarotti
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  • E. Zanazzi
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