Structural analysis of Pt(1 1 1)c(v3 × 5)rect.-CO using photoelectron diffraction
Por:
Nisbet G., Lamont C.L.A., Polcik M., Terborg R., Sayago D.I., Hoeft J.T., Kittel M., Toomes R.L., Woodruff D.P.
Publicada:
1 ene 2007
Resumen:
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. © 2006 Elsevier B.V. All rights reserved.
Filiaciones:
Nisbet G.:
Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, United Kingdom
Lamont C.L.A.:
Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, United Kingdom
Polcik M.:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Terborg R.:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Sayago D.I.:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Hoeft J.T.:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Kittel M.:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Toomes R.L.:
Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom
Woodruff D.P.:
Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom
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