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Investigation of the CO induced lifting of the (1×2) reconstruction on Pt{1 1 0} using synchrotron far-infrared RAIRS

Investigation of the CO induced lifting of the (1×2) reconstruction on Pt{1 1 0} using synchrotron far-infrared RAIRS
Investigation of the CO induced lifting of the (1×2) reconstruction on Pt{1 1 0} using synchrotron far-infrared RAIRS
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.
infrared absorption spectroscopy, carbon monoxide, lead, vibrations of adsorbed molecules, thermal-desorption spectroscopy, vibrational phase relaxation, adsorption, surface, stretch, diffraction, adsorbate, modes, 1x2
0039-6028
111-117
Baily, Christopher J.
9ca8e7be-d044-47ea-955a-7ab8ce4754fe
Surman, Mark
fbb90d91-1a9e-473e-a603-5fdd53459375
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Baily, Christopher J.
9ca8e7be-d044-47ea-955a-7ab8ce4754fe
Surman, Mark
fbb90d91-1a9e-473e-a603-5fdd53459375
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169

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).

Record type: Article

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.

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More information

Published date: 10 January 2003
Keywords: infrared absorption spectroscopy, carbon monoxide, lead, vibrations of adsorbed molecules, thermal-desorption spectroscopy, vibrational phase relaxation, adsorption, surface, stretch, diffraction, adsorbate, modes, 1x2

Identifiers

Local EPrints ID: 19885
URI: http://eprints.soton.ac.uk/id/eprint/19885
ISSN: 0039-6028
PURE UUID: 12ead59b-9998-48f6-abd2-53a684521240
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

Catalogue record

Date deposited: 23 Feb 2006
Last modified: 27 Apr 2022 01:39

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Contributors

Author: Christopher J. Baily
Author: Mark Surman

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