Orientation and bonding of ethylene and ethylidyne on Pt(111) by means of near-edge x-ray absorption fine structure spectroscopy |
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| Authors: | R.J. Koestner J. Stöhr J.L. Gland J.A. Horsley |
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| Affiliation: | Department of Chemistry, University of California, Berkeley, California 94720, USA;Corporate Research Science Laboratories, Exxon Research and Engineering Company, Clinton Township, Annandale, New Jersey 08801, USA |
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| Abstract: | Near-edge X-ray absorption fine structure (NEXAFS) spectra have been measured for ethylene chemisorbed on Pt(111) at 90 and 300 K. From the polarization dependence of the spectra at 90 K, ethylene is found to lie down with a π bond to the surface. The spectra collected at 300 K indicate a CC bond normal to the surface in ethylidyne, and a SCF Xα calculation was carried out to assign the K-edge transitions in this species. The ethylidyne carboncarbon bond (which is nominally a single bond) appears to be shorter (≈0.03 A) than that for chemisorbed ethylene. |
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