Investigation of the CO induced lifting of the (1×2) reconstruction on Pt{1 1 0} using synchrotron far-infrared RAIRS
Baily, Christopher J., Surman, Mark and Russell, Andrea E. (2003) Investigation of the CO induced lifting of the (1×2) reconstruction on Pt{1 1 0} using synchrotron far-infrared RAIRS. Surface Science, 523, (1-2), 111-117. (doi:10.1016/S0039-6028(02)02346-4)
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Official URL: http://dx.doi.org/10.1016/S0039-6028(02)02346-4
Description/Abstract
We present a study of the coverage and temperature dependence of the Pt–CO stretching vibration of CO adsorbed on both the reconstructed Pt{1 1 0}-(1×2) and the unreconstructed Pt{1 1 0}-(1×1) surfaces. The metal–carbon stretching vibration is shown to be a sensitive probe of the structure of the underlying Pt{1 1 0} surface. As a function of coverage, the position of the adsorption peak shifts from 471 to 480 cm−1 at 310 K, accompanying the adsorbate induced lifting of the reconstruction. At 115 K, where the reconstruction is not lifted, the absorption band remains centered at 466 cm−1, however the FWHM increases from 6 cm−1 at 0.05 L to 15 cm−1 at saturation. The band at 466 cm−1 is attributed to initial adsorption into atop sites on the atomic ridges followed by adsorption into atop sites on the (1 1 1) microfacets. The sensitivity of the synchrotron far-infrared RAIRS technique has allowed the lifting of the reconstruction to be followed as a function of temperature and, for the first time, allowed detection of localised lifting of the (1×2) reconstruction at a temperature 50 K lower than previously reported.
| Item Type: | Article |
|---|---|
| ISSN: | 0039-6028 (print) |
| Uncontrolled Keywords: | infrared absorption spectroscopy, carbon monoxide, lead, vibrations of adsorbed molecules, thermal-desorption spectroscopy, vibrational phase relaxation, adsorption, surface, stretch, diffraction, adsorbate, modes, 1x2 |
| Related URLs: | http://dx.doi.org/10.1016/S003...02)02346-4 |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | University Structure - Pre August 2011 > School of Chemistry |
| ePrint ID: | 19885 |
| URI: | http://eprints.soton.ac.uk/id/eprint/19885 |
| Deposited On: | 23 Feb 2006 |
| Last Modified: | 02 Mar 2012 12:45 |
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