The potential energies of rare gas adatoms on clean distorted and undistorted surfaces of simple cubic ionic crystals were computed using the lattice summation method. The numerical computations were carried out for Ne, Ar, and Xe adsorbed on the (100) face of K, Na, and Rb halides. The dependence of binding energy on such physical properties of adsorbents and adsorbates as polarizability and optical dielectric constant was established and the formulas approximating some of these dependences within 10% accuracy were given. Similar relationships were also found for the dispersion energy and the repulsion energy of adatoms at an equilibrium distance from the crystal surface.
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