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Abstract
An analysis of He diffraction data for the MgO(001) surface which goes beyond hard-walleikonal approximations is presented. In a first step, a model potential, for which the form ofa corrugated Morse potential is chosen, is set up using the eikonal approximation inconnection with an effective corrugation function. The obtained corrugation amplitude iscompared to results from density-functional theory calculations of the He–MgO interaction.In a second step, this model potential is used for close-coupling (CC) calculations of Hediffraction intensities. A kinematical analysis of the system He/MgO is given. Theresults on the He diffraction intensities are in good agreement with the experiment.
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