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).

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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Contributors

Author: Andrea E. Russell

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