Ambiguities in adsorbate site assignment from vibrational frequencies. A TLEED structural study of (2 X 1)COPd(110)
✍ Scribed by A. Wander; P. Hu; D.A. King
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 470 KB
- Volume
- 201
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The structure of the (2 x 1 )CO-Pd( 110) surface phase has been determined by LEED intensity analysis. The CO molecule is found to be adsorbed in an atop site, tilted by 11' k 4 a with respect to the surface normal, with a C-O bond length of I. 16 f 0.04 A. Interestingly, the C-0 vibrational frequency for this system (2003 cm-' ) is virtually identical to the frequency observed for the (2 x 1 )CO-Ni( 110) surface phase (1998 cm-') which a previous LEED study has shown involves bridge bound CO molecules. The result indicates that care must be taken in assigning site symmetries on the basis of C-O stretching frequencies alone.