DIFFUSION OF LARGE 2-DIMENSIONAL AG CLUSTERS ON AG(1OO)

Citation
Jm. Wen et al., DIFFUSION OF LARGE 2-DIMENSIONAL AG CLUSTERS ON AG(1OO), Physical review letters, 73(19), 1994, pp. 2591-2594
Citations number
22
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
73
Issue
19
Year of publication
1994
Pages
2591 - 2594
Database
ISI
SICI code
0031-9007(1994)73:19<2591:DOL2AC>2.0.ZU;2-L
Abstract
Scanning tunneling microscopy shows that large two-dimensional Ag clus ters on Ag(100) can diffuse. The value of the diffusion coefficient at room temperature is of order 10(-17) cm(2) s(-1) and varies little, i f at all, with cluster size in the range studied, 100 to 720 atoms per cluster. This weak variation rules out periphery diffusion as the mai n mechanism of cluster diffusion, suggesting instead two-dimensional e vaporation-condensation. This conclusion is compatible with the energe tics of atomic-scale events within the cluster and with the dissolutio n of small clusters observed at low coverages.