Abstract
The infinite barrier model is used to determine the non-local dispersion coefficients Cn. of various molecules adsorbed on noble metal surfaces. The dynamical polarizabilities of the admolecules are obtained from ab initio calculations or refractive index data as an expansion in terms of Cauchy moments. The metal is schematized within the framework of the hydrodynamical model. The behaviour with the adsorption distance of the Cn coefficients (n=3, 4) is given for H2, N2, O2, CO2, HF, HCl, NO, NH3, H2O and N2O, and for the Al, Ag and Cu surfaces. A comparison with previous models is also done for some rare gases and simple atoms (Li, Be, N, O).
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