UNSPECIFIED (1997) Quantitative structural study of the coadsorption of CO and K on Ni(111) using photoelectron diffraction. Surface Science, 393 (1-3). pp. 12-23. ISSN 0039-6028

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Abstract

Scanned energy mode photoelectron diffraction measurements from the K 2p, O 1s and C 1s states of a Ni(111)(2 x 2)-K/nCO (n approximate to 2) coadsorption structure have been coupled with multiple scattering simulations to determine the local adsorption structure. This structure is compared with the structure of the Ni(111)c(4 x 2)-CO phase obtained from a similar analysis of C 1s and O 1s photoelectron diffraction data (which extends earlier work based on the C 1s signal alone), and of the structure of the Ni(111)(2x2)-K phase based on a previously-published analysis of K 2p and K 2s photoelectron diffraction. In the CO coadsorption phase the K atoms retain the atop site of the (2 x 2)-K phase but with a K-Ni bondlength increased by 0.15+/-0.05 Angstrom, and with the outermost Ni layer contraction of the (2 x 2)-K phase replaced by an outer layer expansion. The CO molecules occupy both types of hollow site on the surface with a C-Ni outermost layer spacing of approximately 1.30 Angstrom, but the inferred C-O bondlength shows no statistically significant change from its value in the absence of coadsorbed K. (C) 1997 Elsevier Science B.V.

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:	10 December 1997
Volume:	393
Number:	1-3
Number of Pages:	12
Page Range:	pp. 12-23
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/16090

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