The influence of soft mode adsorbate vibrations on NEXAFS analyses: NO on Pd{110}
✍ Scribed by Jagriti Singh; W.K. Walter; A. Atrei; D.A. King
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 576 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
Near-edge X-ray absorption fine structure (NEXAFS) measurements have been performedon NO adsorbed on Pd{ 1 IO} using a polarized light source at a range of incidence angles. An analysis of intensities of o and n. resonance features is made which includes both the average orientation of the molecule and contributions arising from a low frequency, in-plane hindered-translation mode. The analysis indicates that at all coverages NO is upright, with a hindered-translation mode frequency of 68 cm-' directed along the (001 ) azimuth. The normal frozen-molecule analysis would, incorrectly, yield a tilt angle of 22"; adsorbate molecular orientation cannot be reliably obtained from NEXAFS data at 300 K without including the effect ofthese high-amplitude modes.