Chemical Raman enhancement of organic adsorbates on metal surfaces.
Phys Rev Lett
; 106(8): 083003, 2011 Feb 25.
Article
em En
| MEDLINE
| ID: mdl-21405569
ABSTRACT
Using first-principles theory and experiments, chemical contributions to surface-enhanced Raman spectroscopy for a well-studied organic molecule, benzene thiol, chemisorbed on planar Au(111) surfaces are explained and quantified. Density functional theory calculations of the static Raman tensor demonstrate a strong mode-dependent modification of benzene thiol Raman spectra by Au substrates. Raman active modes with the largest enhancements result from stronger contributions from Au to their electron-vibron coupling, as quantified through a deformation potential. A straightforward and general analysis is introduced to extract chemical enhancement from experiments for specific vibrational modes; measured values are in excellent agreement with our calculations.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fenóis
/
Análise Espectral Raman
/
Compostos de Sulfidrila
/
Ouro
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos