Surface-enhanced Raman scattering from surface and subsurface oxygen species at microscopically well-defined Ag surfaces

B. Pettinger, X. Bao, I. C. Wilcock, M. Muhler, and G. Ertl
Phys. Rev. Lett. 72, 1561 – Published 7 March 1994
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Abstract

Ag(111) and Ag(110) surfaces exposed to oxygen at elevated temperatures (∼800 K) exhibit strongly enhanced Raman bands at 803 and 627 cm1 which are attributed to O atoms strongly chemisorbed on the surface (Oγ) or held in subsurface sites (Oβ), respectively. In contrast to usual experience, surface-enhanced Raman scattering is occurring here under well-defined conditions up to temperatures of 900 K which is attributed to the joint operation of delocalized electromagnetic enhancement (caused by surface roughness provided by oxygen-induced faceting) and local resonance due to the particular electronic properties of the surface sites.

  • Received 29 September 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.1561

©1994 American Physical Society

Authors & Affiliations

B. Pettinger, X. Bao, I. C. Wilcock, M. Muhler, and G. Ertl

  • Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin (Dahlem), Germany

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Vol. 72, Iss. 10 — 7 March 1994

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