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Methyl on Cu(111)-structural determination including influence of co-adsorbed iodine

Pascal, M., Lamont, C.L.A., Kittel, M., Hoeft, J.T., Constant, L., Polcik, M., Bradshaw, A.M., Toomes, R.L. and Woodruff, D.P. (2002) Methyl on Cu(111)-structural determination including influence of co-adsorbed iodine. Surface Science, 512. pp. 173-184. ISSN 0039-6028

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Abstract

The adsorption geometry of the methyl species on Cu(1 1 1) 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 70% of the methyl species occupy these fcc hollows and 30% occupy the ‘hcp' sites above second layer Cu atoms. Best agreement between theory and experiment corresponded to a methyl group adsorbed with C3v 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 Å, but was reduced to 1.62±0.02 Å 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 Å.

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Additional Information: Copyright © 2007 Elsevier B.V. All rights reserved. ScienceDirect® is a registered trademark of Elsevier B.V.
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Subjects: Q Science > QD Chemistry
Schools: School of Applied Sciences
School of Applied Sciences > Materials and Catalysis Research Centre
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Depositing User: Briony Heyhoe
Date Deposited: 13 Jul 2007
Last Modified: 28 Jul 2010 18:20
URI: http://eprints.hud.ac.uk/id/eprint/252

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