Abstract
A quantum statistical theory of physisorption kinetics is formulated taking proper account of the surface phonon modes of a semi-infinite solid. Desorption times are shorter than those calculated with bulk phonons by a factor two to three. For mobile physisorption the rates are dominated by the Rayleigh mode, for localized physisorption by the bulk-like shear horizontal mode. An effective surface Debye temperature is deduced that is about 0.65 to 0.8 times the bulk Debye temperature.
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