Abstract
So far, as we considered the DLEED intensities within the theory based on the statistical approach, their temperature dependence was taken into account only via statistical distribution of adsorbate. The present approach includes the influence of temperature due to vibrations of elements at the substrate, which change the adsorption energy and the pair interaction potential, respectively. The above quantities are evaluated on the basis of the anharmonic potential leading to the temperature renormalization of the hamiltonian describing the adlayer properties. In this way we derive generalized correlation functions of element–element (atom or molecule) displacement at the surface. These functions form the effective temperature dependent potential which allows us to calculate the DLEED intensities, whose temperature dependence is exemplified by the observations of CO molecules adsorbed on 2D surface lattice of Pt(111).
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