Accession Number:

ADA003749

Title:

Surface Studies by Low-Energy Electron Diffraction and Related Techniques.

Descriptive Note:

Final rept.,

Corporate Author:

WISCONSIN UNIV MADISON

Personal Author(s):

Report Date:

1974-12-27

Pagination or Media Count:

7.0

Abstract:

The single scattering contribution of the low-energy electron diffraction LEED intensity has been extracted by an averaging technique. This allows analysis using only simple modifications of conventional diffraction analysis. Very detailed checks of the procedure have been made for clean surfaces of Ni111, Ag111 and W110. The experimentally averaged intensities agrees with the calculated single scattering intensity to within a few percent. In order to study the effects of lattice dynamics a very accurate diffractometer was built to operate from 8 to 1000K. Thermal diffuse scattering of elecrons from Ag were studied and separated into zero, one, and multiphonon scattering events throughout the entire Brillouin zone. This work also makes it possible to account for the thermal scattering sufficiently accurately to study disordered overlayers and surface imperfections on solids. Physisorption of Xe on Ag111 and chemisorption of O on W were studied.

Subject Categories:

  • Physical Chemistry
  • Metallurgy and Metallography
  • Test Facilities, Equipment and Methods
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE