Abstract
The low-energy electron diffraction at crystal surfaces was theoretically investigated by extending Laue's dynamical theory. Inelastic scattering of the electrons and the breakdown of a crystal periodicity at the surface are effectively taken into account. Atomic potential in the crystal is approximated by a screened Coulomb potential (with a constant imaginary part). Explicit formulas were derived for the intensities of the diffracted electron beams from the crystal surface, provided that the intensity of the incident beam is much stronger than that of the diffracted beams. Numerical calculations of the (00) intensity as functions of incident electron energy were carried out for the case of graphite and the result well reproduced general features of the experimental data of Lander and Morrison.
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