Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

A LEED fine structure study of oxygen adsorption on Cu(001) and Cu(111)

Hitchen, G., Thurgate, S. and Jennings, P. (1990) A LEED fine structure study of oxygen adsorption on Cu(001) and Cu(111). Australian Journal of Physics, 43 (5). pp. 519-534.

Link to Published Version:
*Subscription may be required


LEED fine structure features are due to an interference between the measured beam (usually the specular) and a pre-emergent beam. This pre-emergent beam is internally reflected at the surface potential barrier and is subsequently diffracted by the substrate into the same direction as the beam under observation. As a result of the long-range image nature of the barrier potential, a rydberg-like series of peaks, converging on the emergence energy of the pre-emergent beam, is produced. Fine structure features, or threshold effects, occur at very low incident beam energies (typically <40 eV) and are extremely sensitive to the surface order of the crystal. The changes that occur to the fine structure features when atoms are adsorbed onto the surface contain information regarding the nature of the chemisorption process. In some cases it is possible to infer adsorption sites. In this work measurements are made of the fine structure features for the (001) and (111) surfaces of copper as a function of oxygen exposure. Analysis of these data shows that oxygen adsorption on (u(111) takes place in a disordered manner and results in a roughening of the surface, while for (u(OOl) the adsorption produces an ordered overlayer with oxygen atoms in the 2-fold bridge sites.

Item Type: Journal Article
Publisher: CSIRO Publishing
Copyright: © CSIRO 1990
Item Control Page Item Control Page