Abstract
Recent studies of nucleation at surface steps have elucidated the basic mechanisms of step decoration. A systematic study of the condensation of various metals on sodium chloride surfaces demonstrates the influence of the deposition parameters on resolution and contrast of this electron microscope method. In the standard process of decoration which is based on three-dimensional nucleation, the decoration of atomic steps pre-supposes extremely high supersaturations. At low supersaturations involving large critical nuclei only high steps can be decorated. By means of a combined coarse and fine decoration the nuclei can be localized with respect to the step level. A survey of crystal materials accessible to step decoration as well as future areas of application is given.
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