How a resonant charge transfer mechanism determines the relative intensities in the SERS spectra of 4-methylpyridine

被引：25

作者：

Arenas, JF ^{[1
]}

López-Tocón, I ^{[1
]}

Centeno, SP ^{[1
]}

Soto, J ^{[1
]}

Otero, JC ^{[1
]}

机构：

[1] Univ Malaga, Dept Chem Phys, E-29071 Malaga, Spain

来源：

VIBRATIONAL SPECTROSCOPY | 2002年 / 29卷 / 1-2期

关键词：

charge transfer; SERS; 4-methylpyridine; Raman;

D O I：

10.1016/S0924-2031(01)00203-X

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The surface-enhanced Raman scattering (SERS) spectra of 4-methylpyridine (4-MP) have been recorded at different electrode potential versus saturated Ag/AgCl/KCI reference electrode. By comparing the relative intensity of the SERS with the Raman spectrum of the aqueous solution it is possible to determine that 12, 6a, delta(CH) and especially 8a modes are strongly enhanced. In this work, it is demonstrated that these vibrations are closely related to Franck-Condon factors of a resonant photoinduced charge transfer (CT) mechanism similar to a resonance Raman (RR) process. The theoretically calculated DeltaQ displacements represent the differences between geometries of the potential energy minima of the states involved in the resonant process, allowing to calculate the relative intensities in RR from the Peticolas' equation. These calculated intensities are in a perfect agreement with the experimental behavior. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：147 / 154

页数：8

共 19 条

[1] Charge transfer processes in surface-enhanced Raman scattering. Franck-condon active vibrations of pyridine [J].