Enhanced self-diffusion on Cu(111) by trace amounts of s: chemical-reaction-limited kinetics.
Phys Rev Lett
; 93(16): 166101, 2004 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-15525006
ABSTRACT
We find that less than 0.01 monolayer of S can enhance surface self-diffusion on Cu(111) by several orders of magnitude. The measured dependence of two-dimensional island decay rates on S coverage (theta(S)) is consistent with the proposal that Cu3S3 clusters are responsible for the enhancement. Unexpectedly, the decay and ripening are diffusion limited with very low and very high theta(S) but not for intermediate theta(S). To explain this result we propose that surface mass transport in the intermediate region is limited by the rate of reaction to form Cu3S3 clusters on the terraces.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Estados Unidos