Ethylene Adsorption and Reaction on Pd(111): An Angle-Dependent EELS Analysis.
INDIANA UNIV AT BLOOMINGTON DEPT OF PHYSICS
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The chemisorption and surface reactivity of ethylene on a palladium 111 surface near room temperature has been studied by high-resolution electron energy loss spectroscopy EELS. The C2H4 molecule reacts with the Pd111 surface to form a rather stable surface species which is identified as ethylidyne C3-CH3 by analysis of the EELS vibrational spectra. This molecule is also formed on Pt111 and Rh111 and is believed to be symmetrically bonded at threefold surface sites. Angle-dependent EELS spectra are reported and show the relative importance of impact and dipole excitation mechanisms Off-specular data is found to be of critical importance in drawing conclusions about surface bonding symmetry from EELS spectra.
- Atomic and Molecular Physics and Spectroscopy