Abstract
The structure of the Rh(111)-(2 × 2)- C 2 H 3 overlayer that was obtained upon the adsorption of ethylene has been determined using a LEED intensity analysis. In agreement with a prior HREELS study, an ethylidyne (CCH 3) species is found to stand perpendicularly above an hcp hollow site with a carbon-carbon distance of 1.45±0.10 Å and a metal-carbon distance of 2.03±0.07 Å. The Zanazzi-Jona and Pendry R-factors for this structure are 0.49 and 0.52, respectively. By comparison with similar organometallic complexes, the relatively short carbon-carbon distance and long metal-carbon distance can be explained by σ− π hyperconjugation of the surface ethylidyne fragment.
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