Atomic and polyatomic molecules at metal surfaces studied by synchrotron far-IR RAIRS

Rasmita Raval; Adam J. Roberts; Jamie Williams; Timothy S. Nunney; Mark Surman

doi:10.1117/12.290254

16 October 1997 Atomic and polyatomic molecules at metal surfaces studied by synchrotron far-IR RAIRS

Rasmita Raval, Adam J. Roberts, Jamie Williams, Timothy S. Nunney, Mark Surman

Proceedings Volume 3153, Accelerator-Based Infrared Sources and Applications; (1997) https://doi.org/10.1117/12.290254
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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.

Citation Download Citation

Rasmita Raval, Adam J. Roberts, Jamie Williams, Timothy S. Nunney, and Mark Surman "Atomic and polyatomic molecules at metal surfaces studied by synchrotron far-IR RAIRS", Proc. SPIE 3153, Accelerator-Based Infrared Sources and Applications, (16 October 1997); https://doi.org/10.1117/12.290254

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