We present here the first determination of the anisotropy of the surface Debye-Waller factor involved in a surface extended x-ray-absorption fine-structure (SEXAFS) experiment. It is deduced by use of relative temperature-dependent amplitude functions for two different polarizations. The mean square relative displacements of atoms are calculated with an elaborate lattice-dynamical model, treated by a continued-fraction technique. The results are in good agreement which shows the ability of SEXAFS as a valuable tool for the study of surface vibrations.
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Roubin et al. (1986) studied this question.
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