Theory of Helium Adsorption on Simple and Noble Metal Surfaces.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1976
- Accession Number
- ADA029233
Entities
People
- E. Zaremba
- Walter Kohn
Organizations
- University of California, San Diego