Simple Classical Model for the Scattering of Gas Atoms From a Solid Surface: Additional Analyses and Comparisons

A simple classical model for the scattering of gas atoms from a solid surface is proposed and its characteristics are determined. The principal assumptions are (1) the interaction of a gas atom with a surface atom is represented by an impulsive force of repulsion, (2) the gas—surface intermolecular potential is uniform in the plane of the surface (hence the interaction does not change the tangential velocity of the gas particle), (3) the surface atoms are represented by independent particles confined by square‐well potentials, (4) the surface atoms have a Maxwellian velocity distribution. The model incorporates many of the same features as that proposed by Goodman. As a result of these assumptions, the model is simplified to the extent that it contains no adjustable constants.Results are obtained for the angular distribution of the scattered particles. Significant quantitative results are not expected from such a simple model, but the qualitative behavior of the model does agree surprisingly well with the...

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