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          Institute: Fritz-Haber-Institut     Collection: Molecular Physics     Display Documents

ID: 8369.0, Fritz-Haber-Institut / Molecular Physics
Methyl on Cu(111) - structural determination including influence of co-adsorbed iodine
Authors:Pascal, Mathieu; Lamont, Christine L.A.; Kittel, Martin; Hoeft, Jon Tobias; Constant, Laurent; Polcik, Martin; Bradshaw, Alexander M.; Toomes, Rachel; Woodruff, David Phillip
Date of Publication (YYYY-MM-DD):2002-07-01
Title of Journal:Surface Science
Journal Abbrev.:Surf. Sci.
Issue / Number:3
Start Page:173
End Page:184
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:photoelectron diffraction; copper; iodine; alkanes; single crystal surfaces; PHOTOELECTRON DIFFRACTION; SURFACE PHOTOCHEMISTRY; ADSORPTION; NI(111); CHEMISORPTION; PT(111); AG(111); CH3BR; MOLECULES; STABILITY
External Publication Status:published
Document Type:Article
Communicated by:Gerard Meijer
Affiliations:Fritz-Haber-Institut/Molecular Physics
External Affiliations:Univ. of Huddersfield, Huddersfield UK,
Dept. of Physics, University of Warwick, Coventry, UK
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