Accession Number:

ADA025348

Title:

High Resolution Low Energy Electron Diffraction from the Aluminum (100) Surface,

Descriptive Note:

Corporate Author:

ILLINOIS UNIV AT URBANA-CHAMPAIGN COORDINATED SCIENCE LAB

Personal Author(s):

Report Date:

1974-10-01

Pagination or Media Count:

176.0

Abstract:

A new high resolution low energy electron diffractometer has been constructed. This apparatus has been applied in a program of surface studies dealing with the electronic, vibrational, geometrical, and chemical structure of the A1100 surface. The surface-plasmon dispersion relation was examined to provide information important to the understanding of surface electronic properties. Measurements were made at T 100 K and at T 300 K. An apparent temperature dependence of the plasmon dispersion may be attributed primarily to the temperature dependence of the inelastic diffuse background. As a prerequisite to the application of a two-step model to the inelastic data, a survey of specular elastic scattering was conducted. These measurements are presented in absolute intensity units for the case T 85 K. From this data it is possible to calculate the lattice spacing normal to the surface for the surface layer. The influence of lattice vibrational properties on electron scattering has been probed through an examination of the temperature dependence of both coherent and diffuse elastic scattering. The vibrational energy of oxygen adsorbed on the surface has been measured and the excitation probability as a function of scattering geometry has been observed. Author

Subject Categories:

  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE