ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The orientation and symmetry of low-coverage ethylene adsorbed on Pd(110) at 150 K were studied by high-resolution electron energy-loss spectroscopy (HREELS) and near-edge x-ray absorption fine structure (NEXAFS) analysis. HREELS measurements unambiguously revealed that ethylene is π-bonded with the C–C axis preferentially aligned along the [11¯0] row; this finding was also confirmed by NEXAFS. The molecular symmetry of this species was found to be C1 and thus, we proposed that the C–C axis is tilted against the surface. The effect of coadsorption with hydrogen was examined, and a flat-lying species with C2 symmetry was found to dominate on H-covered Pd(110). Furthermore, the coadsorbed hydrogen induced the C–C axis rotated about the surface normal, possibly reflecting the zigzag phase formation of adsorbed hydrogen atoms. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.481168
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