Abstract
We propose a simple way to construct the interaction potential between a low-energy ion and the surface of a monatomic solid, using a sum of pairwise potentials of the Tang-Toennies type. All the parameters of these potentials, except one, are determined by atomic calculations and by the requirement that the asymptotic form of the interaction agrees with the classical image potential. The one adjustable parameter gives the strength of the repulsive part of the potential, assumed to be proportional to the charge density of the atoms in the solid. The K + -W(100) potential constructed in this way is found to agree with the empirical potential used by Hulpke and Mann to fit their scattering data.
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