Semiclassical Description of Inelastic Atom Scattering by Surfaces
Abstract
Inelastic scattering of atoms of moderate energies (say < 5 eV) by solid surfaces is almost entirely due to energy exchange with lattice vibrations. It can give valuable information about the atom-surface interaction potential and the vibrational dynamics at surfaces. Theoretically this process represents a challenging many-body problem, calling for suitable approximation methods. This paper outlines work currently in progress. A simple model problem is solved in which the normal modes of the lattice are schematized by a single one dimentional harmonic oscillator, initially in its groundstate (T = O). The classical solution gives a unique energy loss. The leading quantum correction and a Gaussian final energy distribution found whose width is proportional to sq. rt.(h). The exact results are in general different from the so-called trajectory approximation. A new type of atom-surface scattering experiment is proposed, which will provide a direct measure to the quantum corrections to classical scattering. Keywords: Harmonic oscillator, Gaussian, Trajectory approximation, Atom surface scattering.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1988
- Accession Number
- ADA197696
Entities
People
- Walter Kohn
Organizations
- University of California, Santa Barbara