Theory of Helium Adsorption on Simple and Noble Metal Surfaces.
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS
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The repulsive part of the helium-metal physisorption potential is calculated in the Hartree-Fock approximation. To the lowest order in the overlap S between the atomic and metallic wavefunctions, this interaction is determined by the change in the single-particle density of states of the metal. Combined with a previous calculation of the van der Waals interaction, helium-metal potentials are derived for the simple and noble metals using a jellium model for the metal. Binding energies and equilibrium positions of the helium atom are determined. For the simple metals, the binding energy decreases with increasing r sub s. Its value for the noble metals is between 40 - 70 K. The equilibrium positions are found to be between 3 and 7 A relative to the jellium background for all the metals studied. Author
- Physical Chemistry