Brownian Motion of Vacancy Islands on Ag(111)


Morgenstern, Karina and Rosenfeld, Georg and Poelsema, Bene and Comsa, George (1995) Brownian Motion of Vacancy Islands on Ag(111). Physical Review Letters, 74 (11). pp. 2058-2061. ISSN 0031-9007

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Abstract:The motion of monatomic deep vacancy islands on crystal surfaces is studied both theoretically and experimentally. We develop a new theoretical model which allows us to deduce the microscopic mechanism of mass transport from measuring the diffusion coefficients of the vacancy islands as a function of their size. This model is applied to experimental results obtained with a fast scanning tunneling microscope on Ag(111) at room temperature. The observed scaling is consistent with a mechanism where the microscopic mass transport is dominated by diffusion of adatoms across the vacancy island rather than along the island boundary.
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Copyright:© 1995 The American Physical Society
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