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We report the results of a density-functional study of the diffusion of Ptdimers on the (111) surface of Pt. The calculated activation energy of 0.37 eVis in {\em exact} agreement with the recent experiment of Kyuno {\em et al.}\protect{[}Surf. Sci. {\bf 397}, 191 (1998)\protect{]}. Our calculationsestablish that the dimers are mobile at temperatures of interest for adatomdiffusion, and thus contribute to mass transport. They also indicate that thediffusion path for dimers consists of a sequence of one-atom and (concerted)two-atom jumps.

physical review. b, condensed matter

Diffusion of Pt dimers on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Pt</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>111</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>

Diffusion of Pt dimers onPt(111)