Rolling: A fast diffusion mechanism for small clusters on a solid surface

Citation
W. Fan et al., Rolling: A fast diffusion mechanism for small clusters on a solid surface, PHYS REV B, 60(15), 1999, pp. 10727-10730
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
0163-1829 → ACNP
Volume
60
Issue
15
Year of publication
1999
Pages
10727 - 10730
Database
ISI
SICI code
0163-1829(19991015)60:15<10727:RAFDMF>2.0.ZU;2-D
Abstract
We have performed molecular-dynamics simulations to analyze diffusion of sm all clusters on a solid surface, and found a new diffusion mechanism in whi ch a spherical-like cluster can move rapidly with a rolling motion. When ap plied to Ni-n (n = 1 - 14) clusters on the Au(110)-(1 x 2) surface, our mod el predicted a cluster-size dependence in diffusion, with the most spherica l-like Ni-4 and Ni-13 having the largest diffusion constants. Our model als o confirmed that diffusion of Ni across the [1 (1) over bar 0] troughs is s lower than diffusion along the troughs. For the transverse diffusion, rolli ng of Ni-4 is, once again, an effective mode of cluster motion. [S0163-1829 (99)03139-2].