DIRECT METHODS IN SURFACE CRYSTALLOGRAPHY

Conventional methods of determining surface structure from LEED intensity measurements face severe problems when confronted with complex or unconventional surface structures forcing a restricted search of parameter space, possibly leading to errors in the determination. Direct Methods sidestep this problem. In this paper we discuss several possible implementations of the Direct Methods and illustrate one of them with the example of p(2 × 2)O Rh(100). The output from a Direct Methods calculation is the probability distribution of the surface atoms and the paper concludes with a discussion of the possibility for study of anharmonic thermal vibrations, and of translational motion which this opens up. © 1990.