The Temperature Dependence of Diffracted Beam Intensities in Atom-Surface Scattering.
Abstract
We develop a new method for the calculation of the atom scattering analog of the Debye-Waller factor. Unlike X-ray and neutron scattering the properties of an atom scattered by a solid surface cannot be computer by perturbation theory, therefore the simple Debye-Waller theory cannot be applied. Nevertheless the Debye-Waller phenomenon has a close analog: the elastic intensity is depressed due to the uncorrelated part of the thermal motion of the lattice atoms. To compute this effect we develop a time dependent scattering theory in which the quantum properties of the scattered atom are described by propagating coherently an ensemble of wave packets and lattice motion is simulated by a classical Langevin equation. Applications are made to He and Ne scattering from a surface whose lattice dynamics mimics that of Pt(111) but whose corrugation was slightly increased to enrich the diffraction structure. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA152762
Entities
People
- B. V. Jackson
- H. Metiu
Organizations
- University of California, Santa Barbara