Structural analysis of Pt(1 1 1)c(√3 × 5)rect.–CO using photoelectron diffraction
| Autor: | Martin Kittel, Martin Polcik, Jon Tobias Hoeft, Ralf Terborg, David Phillip Woodruff, David I. Sayago, Christine L. A. Lamont, Rachel L. Toomes, G. Nisbet |
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| Rok vydání: | 2007 |
| Předmět: |
Diffraction
Low-energy electron diffraction Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Surfaces Coatings and Films Ion chemistry.chemical_compound Crystallography chemistry Transition metal Chemisorption Desorption Materials Chemistry Platinum QC Carbon monoxide |
| Zdroj: | Surface Science. 601:1296-1303 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2006.12.073 |
| Popis: | Core level shift scanned-energy mode photoelectron diffraction using the two distinct components of the C 1s emission has been used to determine the structure of the Pt(1 1 1)c(√3 × 5)rect.–CO phase formed by 0.6 ML of adsorbed CO. The results confirm earlier assignments of these components to CO in atop and bridging sites, further confirm that the best structural model involves a 2:1 occupation ratio of these two sites, and provides quantitative structural parameter values. In particular the Pt–C chemisorption bondlengths for the atop and bridging sites are, respectively, 1.86 ± 0.02 Å and 2.02 ± 0.04 Å. These values are closely similar to those found in the 0.5 ML coverage c(4 × 2) phase, involving an atop:bridge occupation ratio of 1:1, obtained in earlier quantitative low energy electron diffraction studies. The results also indicate a clear tilt of the molecular axis of atop CO species in this compression phase, consistent with the finding of an earlier electron-stimulated desorption ion angular distribution investigation |
| Databáze: | OpenAIRE |
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