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
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.