Abstract
Regular step arrays on a surface change the low energy electron diffraction (LEED) pattern of that surface in a characteristic manner by causing some spots to be split into doublets as recently shown by Ellis and Schwoebel. In the present study on cleaved germanium, doublets due to step arrays were found in patterns obtained from certain regions of the surface. The dependence of the extent of spot splitting on LEED beam voltage, step spacing, and step height is calculated using a kinematical approximation. The step height of a single step in the arrays was always calculated to be one double layer. The step spacing in any one area was constant, but varied between 5 and 15 atomic distances for different areas. It is shown that a LEED study of step arrays gives detailed information on the properties of cleaved surfaces.
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