Atomic and Molecular Scattering from Solids. II. Comparison of Classical Scattering Models in Relation to Experiment

Characteristics of a classical two–dimensional (2d) model of atomic scattering from finite temperature, elastic solids are compared to similar characteristics of “quasi‐1d” scattering models in light of pertinent experimental scattering studies of rare‐gas atomic beams on metals. (The term “quasi‐1d” is used to denote scattering models based on the assumption that tangential interaction is negligible, i.e., dynamical interaction is presumed to occur only in the direction normal to the local surface plane.) The 2d finite‐range interaction field (denoted 2d FRI) is composed of additive Lennard‐Jones (12, 6) pairwise potentials. Compared scattering characteristics include beam directivity and position as well as variation of mean tangential/normal momentum with scattering angle. It is shown that combined “structure” and “thermal” broadening associated with 2d FRI can account for systematic differences between experimentally observed lobe directivity and that predicted by quasi‐1d “soft/hard cube” scattering ...

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