Abstract
The effect of an interface of rare earth oxide/transition metal upon CO adsorption was investigated on the Ru(001) surface partially covered with SmO X, which was prepared by means of the selective oxidation of Sm in a Sm+CO coadsorption system on Ru(001). Temperature programmed desorption and ultraviolet photoelectron spectroscopy results indicated that two characteristic adsorption states of CO presented at the interface of SmO X/Ru(001) depending on the coverage of preadsorbed Sm. For the low Sm coverage below ∼0.3 monolayer, the interface was completely oxidized and the CO species placed at the interface site desorbed at lower temperature than that on a bare Ru site. For the higher Sm coverage, in contrast, the boundary of SmO X island was defective in oxygen and the interface of SmO X/Ru(001) yielded more tightly CO bonding state compared with the bare Ru site.
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