Abstract
Sulfur segregation on a heated Cu 3Au(110) surface has been studied with scanning electron microscopy (SEM) and scanning Auger microscopy (SAM) in an ultra-high vacuum (UHV) environment. A special kind of spot contrast in the SEM images is observed as a result of the sulfur segregation. The spots are identified as segregating Au islands induced by the adsorption of sulfur on the surface. The imaging contrast mechanism of these islands is discussed. A kind of contact potential contrast is proposed to explain the SEM image contrast change with the surface sulfur coverage. Using the observed results the segregation processes can be clearly described and previous experimental results can be explained consistently.
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