Abstract

The interaction of adsorbed molecules with molecules of the underlying solid undergoing thermal oscillations is discussed and calculated. The friction coefficient for the adsorbed molecules has been evaluated by means of some approximate formulae and compared with the experimental data. The kinetic equations describing a non-uniform state of adsorbed gas has been solved by the Chapman-Enskog perturbation method. The phenomena of surface diffusion, thermal diffusion, thermal conduction and viscosity are discussed on the basis of the second approximation of this method. The application of this theory to the separation of components of adsorbed gas by surface flow is described in detail. The theory of surface separation of isotopes is also discussed and compared with experimental data.

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