Surface-enhanced Raman scattering of 2,3-dimethylpyrazine adsorbed on silver electrode: selective enhancement explained through the charge transfer mechanism

The surface-enhanced Raman spectra (SERS) of 2,3-dimethylpyrazine adsorbed on silver have been recorded at different electrode potentials. The main feature of the SERS spectra is the selective enhancement of the vibration 8a, while the remaining vibrations do not undergo any noticeable enhancement....

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Bibliographic Details
Published in:Vibrational spectroscopy 2004-06, Vol.35 (1), p.39-44
Main Authors: Arenas, J.F, Centeno, S.P, López-Tocón, I, Otero, J.C
Format: Article
Language:English
Subjects:
2,3-Dimethylpyrazine
Charge transfer
Raman
SERS
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Summary:The surface-enhanced Raman spectra (SERS) of 2,3-dimethylpyrazine adsorbed on silver have been recorded at different electrode potentials. The main feature of the SERS spectra is the selective enhancement of the vibration 8a, while the remaining vibrations do not undergo any noticeable enhancement. This behavior has been explained according to a photoinduced charge transfer mechanism between the metal and the adsorbate, involving the ground electronic states of the neutral molecule (S 0 state) and the radical anion (D 0 state), given that the incoming photon induces the transfer of an electron from the Fermi level of the metal to vacant orbitals of the adsorbate.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2003.11.012