Surface Core-Level Shifts at an oxygen-rich Ru Surface: O/Ru(0001) vs. RuO_2(110)

Details Surface Core-Level Shifts at an oxygen-rich Ru Surface: O/Ru(0001) vs. RuO_2(110) Surface Core-Level Shifts at an oxygen-rich Ru Surface: O/Ru(0001) vs. RuO_2(110)

2001-04-17

arxiv.org/abs/cond-mat/0104306v2

Surf. Sci. 490, 20 (2001).

Physics

Condensed Matter

Materials Science

7 pages including 3 figures. Surf. Sci. in press. Related publications can be found at http://www.fhi-berlin.mpg.de/th/paper.h

Scientific paper

10.1016/S0039-6028(01)01214-6

We present density-functional theory calculations of Ru 3d and O 1s surface core-level shifts (SCLSs) at an oxygen-rich Ru(0001) surface, namely for the O(1x1)/Ru(0001) chemisorption phase and for two surface terminations of fully oxidized RuO_2(110). Including final-state effects, the computed SCLSs can be employed for the analysis of experimental X-ray photoelectron spectroscopy (XPS) data enabling a detailed study of the oxidation behaviour of the Ru(0001) surface. We show that certain peaks can be used as a fingerprint for the existence of the various phases and propose that the long disputed satellite peak in RuO_2(110) XPS data originates from a hitherto unaccounted surface termination.

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