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Proceedings Paper

Atomic and polyatomic molecules at metal surfaces studied by synchrotron far-IR RAIRS
Author(s): Rasmita Raval; Adam J. Roberts; Jamie Williams; Timothy S. Nunney; Mark Surman
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Paper Abstract

Far-IR Reflection Absorption Infrared Spectroscopy (RAIRS) has been used to probe submonolayers of adsorbates created under clean controlled conditions on small area single crystal surfaces, using the newly commissioned Daresbury 13.3 Far-IR synchrotron beamline. Adsorbed formate species on Cu(110) were studied as an example of an adsorbate for which a large structural data-base already exists in the literature from other surface science techniques. Our high resolution Far-IR data has allowed two distinct vCu-O vibrations to be monitored for 0.25 monolayer of formate adsorbed on Cu(110) at 300 K. We rule out a lower symmetry formate complex giving rise to these vibrations and, instead, attribute the two bands to at least two chemically distinct species at the surface, a possibility that has hitherto not been included in the analyses of this system using other techniques. In addition, we also report the first RAIRS spectrum of the vCu-O stretching vibration for adsorbed atomic O on the Cu(110) surface at 300 K. The dissociative adsorption of oxygen, at room temperature, on this surface is known to induce a massive reconstruction of the surface in which `added' rows of Cu-O-Cu strings form on the surface in the [001] direction to give rise to the (1 X 2) missing row structure. The vCu-O vibration frequency is found to be invariant as a function of coverage, suggesting that the chemical nature of the Cu-O-Cu entity remains essentially unaltered during the growth of the reconstructed phase.

Paper Details

Date Published: 16 October 1997
PDF: 7 pages
Proc. SPIE 3153, Accelerator-Based Infrared Sources and Applications, (16 October 1997); doi: 10.1117/12.290254
Show Author Affiliations
Rasmita Raval, Univ. of Liverpool (United Kingdom)
Adam J. Roberts, Univ. of Liverpool (United Kingdom)
Jamie Williams, Univ. of Liverpool (United Kingdom)
Timothy S. Nunney, Univ. of Liverpool (United Kingdom)
Mark Surman, CLRC Daresbury Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 3153:
Accelerator-Based Infrared Sources and Applications
Gwyn P. Williams; Paul Dumas, Editor(s)

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