Local and nonlocal effects in the theory of physisorption

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Abstract
A review of our microscpic theory of physisorption is presented. The effects of spatial dispersion in the metal for two boundary conditions at the metal surface are discussed and compared with results of the local−dielectric−response theory. It is shown that in the presence of spatial dispersion the Van der Waals interaction decreases more rapidly than the d−3 law of the local theory. In both cases, an adequate determination of the attractive energy requires an accurate description of the dynamic polarizability of the incident atom. Repulsive contributions to the interaction energy are included via the density−functional formalism, resulting in a complete description of the interaction energy curve. The equilibrium distances of the atom are a monotonically increasing function of the metallic−electron density and are not affected significantly by nonlocality in the metal.

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