Photoinduced charge transfer processes in the surface-enhanced Raman scattering of 2,4,6-trimethylpyridine recorded on silver electrode

✍ Scribed by Isabel López-Tocón; Silvia P. Centeno; José Luis Castro; M.Rosa López-Ramı́rez; Juan Carlos Otero

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 203 KB
• Volume: 377
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)01090-x

✦ Synopsis

Surface-enhanced Raman scattering spectra of 2,4,6-trimethylpyridine recorded on silver at different electrode potentials have been analyzed on the basis of a charge transfer enhancement mechanism. The main feature of surfaceenhanced Raman scattering is the enhancement of the band corresponding to the 8a mode at negative electrode potentials. This behavior can be explained by Franck-Condon factors related to a photoinduced electron transfer process between the metal and the adsorbate. The selective surface-enhanced Raman scattering enhancement is related to the differences between the ab initio equilibrium geometries of the electronic levels involved in the resonant mechanism, i.e., the ground states of the neutral adsorbate and the respective radical anion.