The effect of adsorbate interactions on self-diffusion on (111) surfaces was examined by calculating the activation barriers and pre-factors for diffusion of an adatom in the presence of a second adatom. Molecular dynamics simulations were also performed. The calculations revealed that the main effect upon the mobility of an adatom, due to the presence of a second adatom, arose from modifications of the activation barriers. The pre-factors were essentially the same as those for single-atom diffusion; beyond the adatom separations of next-nearest neighbor sites.

Effect of Adsorbate Interactions on Adatom Self-Diffusion on Cu(111) and Ni(111) Surfaces. U.Kürpick: Physical Review B, 2002, 66[16], 165431 (6pp)