Abstract
Determination of the atomic structure of stepped surfaces by quantitative low-energy electron diffraction (LEED) analysis is very difficult when the spacings between layers parallel to the surface become significantly smaller than about 0.9 Å. For most of the computer programs widely used in LEED crystallography the problem is caused by numerical instabilities and lack of convergence. However, the CHANGE computer program has had remarkable success on surfaces with interlayer spacings as small as 0.5 Å. Advantages and disadvantages of this program are briefly discussed. CHANGE is now available to run conveniently on desk-top personal computers.
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