Abstract
Ag(111) and Ag(110) surfaces exposed to oxygen at elevated temperatures (∼800 K) exhibit strongly enhanced Raman bands at 803 and 627 which are attributed to O atoms strongly chemisorbed on the surface () or held in subsurface sites (), 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