UNSPECIFIED (1996) Local structure determination for low-coverage CO on Ni(111). JOURNAL OF PHYSICS-CONDENSED MATTER, 8 (10). pp. 1367-1379. ISSN 0953-8984

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Abstract

Scanned-energy-mode photoelectron diffraction has been used to determine the local adsorption structure of CO on Ni(lll) at low temperature at a coverage of approximately 0.25 Mi,, corresponding to a nominal (2 x 2) phase. CO molecules are found to occupy the same two ('hcp' and 'fcc') inequivalent hollow sites as in the 0.5 ML c(4 x 2)-CO phase, and while the results do indicate a preference for the hcp hollow site directly above a second-layer Ni atom in the low-coverage state, this preference (65 +/- 20%) is of marginal statistical significance. The similarity of this parameter in both the (2 x 2) and c(4 x 2) phases can only be reconciled by assuming significant local disorder. It does, however, indicate that the local binding energies at the two hollow sites are very similar and that the presence of both sites in the c(4 x 2) phase is not simply a consequence of near-neighbour adsorbate-adsorbate repulsion.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
ISSN:	0953-8984
Date:	4 March 1996
Volume:	8
Number:	10
Number of Pages:	13
Page Range:	pp. 1367-1379
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/19005

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