✍ Scribed by J.R. Noonan; H.L. Davis
No coin nor oath required. For personal study only.
Results obtained from studies of the Cu( 100) and Ag( ) surfaces indicate that LEED structural analyses of clean metallic surfaces can be sensitive to changes on the order of 0.02 A in atomic spacing. This sensitivity was achieved by placing particular emphasis on both obtaining a reliable experimental data base and studying the effects of nonstructural parameters which are used in dynamical LEED calculations.
Error reduction in the experimental I-V profiles was accomplished by using a technique where nonspecular profiles, collected for normal incidence, were averaged over their symmetrically equivalent set. Studies were then performed on the effects which variation of the nonstructural parameters (scattering phase shifts, complex optical potential, and Deb ye temperature) had on the structural conclusions of the analyses. The only structural parameter varied in this work was the first interlayer spacing. The best results from sets of calculations exhibited very good agreement with the mean experimental profiles. Although the improved sensitivity obtained in these analyses was achieved only for clean metallic surfaces, it is felt that the techniques employed in our investigations are generally applicable to other surface systems.
📜 SIMILAR VOLUMES