ATOM DYNAMICS ON PT, IR AND CU SURFACES - AN EXPERIMENTAL-STUDY USINGVARIOUS TECHNIQUES

Citation
Tt. Tsong et al., ATOM DYNAMICS ON PT, IR AND CU SURFACES - AN EXPERIMENTAL-STUDY USINGVARIOUS TECHNIQUES, Surface review and letters, 3(2), 1996, pp. 1259-1269
Citations number
25
Categorie Soggetti
Physics, Condensed Matter","Physics, Atomic, Molecular & Chemical","Material Science
Journal title
ISSN journal
0218625X
Volume
3
Issue
2
Year of publication
1996
Pages
1259 - 1269
Database
ISI
SICI code
0218-625X(1996)3:2<1259:ADOPIA>2.0.ZU;2-0
Abstract
Some metallic adsorbed atoms on fee metal surfaces can exchange with s ubstrate atoms well below the room temperature. For homogeneous system s, the atomic exchange is a mechanism for self-diffusion. For heteroge neous systems, it is a mechanism for point alloy formation of only the top surface layer but it will also induce self-diffusion. We present experimental evidence found from FIM, HREELS and LEIS studies. These e xperiments and their relations to available theories and molecular dyn amic simulations of this phenomenon are also mentioned. In addition, w e present evidence for the ascending motion of step edge atoms to the upper terrace for the Ir (111) surface, and the result of a measuremen t of the potential barrier height of the ascending motion and the diss ociation energy of step edge atoms to the lower terrace.