Abstract
A tin-plated knife edge held against a gold surface has been aged at room temperature in air for about 2×108 s (6-1/2 years). Auger electron spectroscopy is used to detect the presence or absence of Sn on the Au surface at various locations near the knife edge. With a practical horizontal resolution limit of a few microns, very little surface diffusion was detected. The values (or upper bounds) of diffusion coefficients are calculated, and these values are compared and contrasted to the values predicted from classical surface diffusion measurements. In air, at room temperature, Sn in contact with an Au surface appears to diffuse slower than projected from extrapolation from higher temperature.
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Schedule a callMore From: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
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