Abstract
Electron energy loss spectra have been detected on a Ni(100) surface above the M 2, 3 core edge at several different temperatures, between 80 and 1300K. We find a strong temperature dependence of the SEELFS signal. In particular we find a strong attenuation of the signal on increasing the temperature (especially the part originating from higher coordination shells). We find also an apparent contraction of the nearest neighbour distance obtained by the Fourier transform technique. We present a model calculation by which we tentatively interpret the apparent contraction as originating from an artifact introduced by the experimental integration limits of the Fourier transform. This in turn is due to an asymmetric pair distribution function of atoms in the surface region.
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