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| 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 | | Language: | English | | Date of Publication (YYYY-MM-DD): | 2002-07-01 | | Title of Journal: | Surface Science | | Journal Abbrev.: | Surf. Sci. | | Volume: | 512 | | 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
| | Identifiers: | URL:http://www.sciencedirect.com/science?_ob=ArticleUR... | |
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