Direct observation of subsurface oxygen on Rh(111)

Wider, J.; Greber, T.; Wetli, E.; Kreutz, T.J.; Schwaller, Patrick; Osterwalder, J. (1998). Direct observation of subsurface oxygen on Rh(111) Surface Science, 417(2-3), pp. 301-310. Elsevier 10.1016/S0039-6028(98)00674-8

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A Rh(111) surface has been exposed to oxygen under conditions that favour the formation of a subsurface oxygen species. After exposure to 105 L O2 at a surface temperature of 470 K X-ray photoelectron diffraction data of O 1s emission reveal that (5±2)% of a monolayer of oxygen atoms occupy octahedral interstitial sites just underneath fcc adsorption sites. The occupation of such a site forces the oxygen atoms adsorbed in its close vicinity to switch from the stable fcc site to the hcp adsorption site. Implications of this finding for the interpretation of temperature-programmed desorption spectra, as well as for the catalytic behaviour of the oxidized Rh(111) surface, are discussed.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Engineering and Computer Science > Institute for Surface Applied Laser, Phototonics and Surface Technologies ALPS School of Engineering and Computer Science
Name:	Wider, J.; Greber, T.; Wetli, E.; Kreutz, T.J.; Schwaller, Patrick and Osterwalder, J.
ISSN:	0039-6028
Publisher:	Elsevier
Language:	English
Submitter:	Patrick Schwaller
Date Deposited:	10 Dec 2019 09:15
Last Modified:	10 Dec 2019 09:15
Publisher DOI:	10.1016/S0039-6028(98)00674-8
ARBOR DOI:	10.24451/arbor.9287
URI:	https://arbor.bfh.ch/id/eprint/9287