Second-Order Semiclassical Perturbation Theory for Diffractive Scattering from a Surface

10 págs.; 3 figs.; 2 apps.A second-order semiclassical perturbation theory is developed and applied to the elastic scattering of an atom from a corrugated surface. Analytical expressions for the diffraction pattern in the momentum space are obtained based on a sine corrugation function and a Morse potential for the interaction of the particle with the surface. The theory is implemented for a model of the in-plane scattering of Ar atoms from a LiF(100) surface. The resulting diffraction intensities are compared with second-order perturbation theory classical distributions and close-coupling results for two incident energies of 300 and 700 meV. The previous first-order perturbation theory predicts a symmetric diffraction pattern about the elastic peak, while the second-order semiclassical perturbation theory accounts correctly for the asymmetry in the diffraction pattern. © 2014 American Chemical SocietyThis work has been supported by grants of the Israel Science Foundation, the German-Israel Foundation for Basic Research, the Minerva Foundation, the Einstein center at the Weizmann Institute of Science, and the Ministerio de Economia y Competitividad under Project No. FIS2011-29596−C02-C01. We also acknowledge support from the COST Action MP1006.Peer Reviewe