UNSPECIFIED (1996) Structure determination of a CO/O coadsorption phase on Ni(111). Surface Science, 351 (1-3). pp. 1-12. ISSN 0039-6028

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Abstract

The structure of the Ni(111)(2 x 2)-O-CO adsorption phase, formed by CO adsorption onto a Ni(111)(2 x 2)-O phase, has been determined by scanned-energy mode photoelectron diffraction of both the C 1s and O 1s signals. Contrary to earlier interpretation of vibrational spectroscopic data, the CO molecules occupy the same threefold coordinated hollow sites which they adopt on the clean Ni(111) surface, with a Ni-C bondlength of 1.95+/-0.04 Angstrom and a C-O bondlength of 1.17+/-0.03 Angstrom. Changes in both Ni-C bondlength and the vibrational amplitude of the CO molecule against the surface are related to the weaker CO-metal bonding in the presence of the atomic oxygen. The chemisorbed oxygen atoms occupy the same ''fcc'' hollow sites, directly above third layer Ni atoms, both before and after CO adsorption.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	Surface Science
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0039-6028
Date:	1 May 1996
Volume:	351
Number:	1-3
Number of Pages:	12
Page Range:	pp. 1-12
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18811

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