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The Equilibrium Distribution of Gas Molecules Adsorbed on an Active Surface

Stephen L. Adler, Indrajit Mitra

physics.data-anarXiv:physics/0003002

Abstract

We evaluate the exact equilibrium distribution of gas molecules adsorbed on an active surface with an infinite number of attachment sites. Our result is a Poisson distribution having mean X = μP Ps Pe, with μ the mean gas density, Ps the sticking probability, Pe the evaporation probability in a time interval τ, and P Smoluchowski's exit probability in time interval τ for the surface in question. We then solve for the case of a finite number of attachment sites using the mean field approximation, recovering in this case the Langmuir isotherm.

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