2-DIMENSIONAL ALLOYING OF AU AND AG OVERLAYER ON RU(001) - PHOTOREMISSION AND THERMAL-DESORPTION SPECTROSCOPY STUDIES

Citation
A. Bzowski et al., 2-DIMENSIONAL ALLOYING OF AU AND AG OVERLAYER ON RU(001) - PHOTOREMISSION AND THERMAL-DESORPTION SPECTROSCOPY STUDIES, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 12(4), 1994, pp. 1790-1794
Citations number
15
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
ISSN journal
07342101
Volume
12
Issue
4
Year of publication
1994
Part
2
Pages
1790 - 1794
Database
ISI
SICI code
0734-2101(1994)12:4<1790:2AOAAA>2.0.ZU;2-W
Abstract
Photoemission spectroscopy with synchrotron radiation has been used to study the valence-band behavior as well as the Au 4f core-level bindi ng energy shifts of coadsorbed Au and Ag overlayers on Ru(001) at one- monolayer coverage each as monitored with thermal desorption measureme nts. The results were compared with bulk Au-Ag results obtained previo usly to determine if and under what conditions a two-dimensional alloy is formed. We found that alloying occurred to some extent at room tem perature and a stable alloy was formed at elevated temperatures (800 K ) when Ag was deposited first, while there was no alloying when Au was deposited first on the Ru substrate. It appears that there is a signi ficant difference in the electronic structure of the overlayers depend ing on the order of the deposition. These results and their implicatio ns are discussed.