Abstract
A variety of jumps has in the past been identified in diffusion of atoms on 1D channeled surfaces. To establish the jump processes important in diffusion on a 2D surface, the movement of individual Pd atoms has been examined on W(110). From the distribution of displacements of Pd at high temperatures, double jumps are found along the close-packed . For the first time, sizable differences are also observed between the mean-square displacements along and , which demonstrate unexpected contributions from jumps along , but not along . These jumps proceed over activation barriers higher than for single jumps, under conditions predicted from previous work with Pd on the channeled W(211).
- Received 18 December 2001
DOI:https://doi.org/10.1103/PhysRevLett.88.236102
©2002 American Physical Society