UNSPECIFIED (2002) Methyl on Cu(111) - structural determination including influence of co-adsorbed iodine. Surface Science, 512 (3). pp. 173-184.

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Abstract

The adsorption geometry of the methyl species on Cu(111) with and without coadsorbed iodine has been determined using scanned energy mode photoelectron diffraction. Under all circumstances the three-fold-coordinated hollow sites are occupied. At saturation coverage of pure methyl species only the 'fcc' site, directly above a third layer Cu atom is occupied, whereas at half saturation coverage similar to70% of the methyl species occupy these fcc hollows and similar to30% occupy the 'hcp' sites above second layer Cu atoms. Best agreement between theory and experiment corresponded to a methyl group adsorbed with C-3v symmetry, but the possibility that the species was tilted on the surface could not be excluded. The height of the C above the surface in a pure methyl layer was 1.66 +/- 0.02 Angstrom, but was reduced to 1.62 +/- 0.02 Angstrom in the presence of co-adsorbed iodine, suggesting that iodine may increase the strength of adsorption. Iodine was also found to occupy the fcc hollow sites with a Cu-I bondlength of 2.61 +/- 0.02 k (C) 2002 Elsevier Science B.V. All rights reserved.

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
Official Date:	1 July 2002
Dates:	Date Event 1 July 2002 UNSPECIFIED
Volume:	512
Number:	3
Number of Pages:	12
Page Range:	pp. 173-184
Publication Status:	Published

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