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Moritz, Wolfgang; Landskron, J. (1995): Anisotropic temperature factors in the calculation of low-energy electron diffraction intensities. In: Surface Science, Vol. 337, No. 3: pp. 278-284
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The multiple scattering theory of LEED is extended to include anisotropic thermal vibrations. The method is based on the multipole expansion of the probability density function. This treatment of anisotropic vibrations leads to thermally averaged atomic scattering t-matrices with off-diagonal terms to be inserted in the current multiple scattering formalism. The multipole expansion allows the calculation of anisotropic and anharmonic vibrations. Correlation effects are neglected as in the currently used treatment of isotropic vibrations.