Abstract
The formalism of the generalized susceptibility theory is applied to the calculation of the substrate-mediated long-range interaction energy between atoms or molecules adsorbed on metal or dielectric surfaces. It is shown that a discrete description of the substrate can increase the magnitude of the metal substrate-mediated dispersion energy between rare gas atoms by a factor 2 with respect to the results of the continuum approach. The influence of the energy is maximum when the atomic density of the surface is the greatest, which corresponds to a minimum of corrugation. For ionic crystals, the substrate-mediated multipolar energy between adsorbed molecules can also play a significant role in the determination of the orientational and translational configurations of an adsorbed molecular overlayer.
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