Abstract

Using X-ray excitation, well-resolved oxygen KLL Auger spectra have been obtained from chemisorbed layers of oxygen and carbon monoxide on Ru(001). These spectra are markedly different, while the spectrum of CO on Ru(001) is quite similar to the Auger spectrum from gaseous CO. The shift between the spectra of gaseous and adsorbed CO is much larger than for the corresponding XPS spectra, a fact understandable in terms of image charge screening. The use of XAES as a fingerprinting method for adsorbed species is recommended.

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