UNSPECIFIED (1993) THE LOCAL ADSORPTION STRUCTURE OF ACETYLENE ON CU(111). Surface Science, 291 (3). pp. 295-308. ISSN 0039-6028

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Abstract

A quantitative structural study of the adsorption of acetylene on Cu(111) has been carried out by scanned energy mode photoelectron diffraction from the C ls core levels. The molecule is found to be adsorbed with the C-C axis almost parallel to the surface with the carbon atoms occupying the two symmetrically distinct three-fold coordinated hollow sites on the surface. The C to top Cu atom layer spacing appears to be slightly smaller (1.38 +/- 0.03 angstrom) above the ''fcc'' hollow site (above a third-layer Cu atom) than above the ''hcp'' hollow site (1.44 +/- 0.03 angstrom). The best fit to theory is obtained with the C atoms exactly in the three-fold symmetric sites of the substrate which constrains the C-C bondlength to a value (1.48 +/- 0.10 angstrom) substantially larger than that of the free molecule. This result is consistent with previously published vibrational spectroscopy from this adsorption system which indicates significant lowering of the C-C bond order.

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 July 1993
Volume:	291
Number:	3
Number of Pages:	14
Page Range:	pp. 295-308
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/21223

Data sourced from Thomson Reuters' Web of Knowledge

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