Chemical contribution to surface-enhanced Raman scattering
Chemical contribution to surface-enhanced Raman scattering
复制标题
DOI：
10.1103/physrevlett.96.207401
复制
发表时间：
2006-05-26
影响因子：
8.6
通讯作者：
Zhang, ZY
中科院分区：
文献类型：
--
作者：
Persson, BNJ;Zhao, K;Zhang, ZY
提出了一种新的表面增强拉曼散射（Sers）的化学贡献机制。该理论考虑了金属纳米团簇或平坦金属表面的极化率通过吸附分子的振动运动的调制。衬底的调制偏振与入射光耦合将有助于拉曼散射增强。我们表明，对于金属簇和平坦的金属表面，这种新的化学贡献可以分别增强拉曼散射强度的10（2）和10（4）的因子。这种新的Sers过程是由分子结合位点处平行于金属基底表面的电场决定的。
We present a new mechanism for the chemical contribution to surface-enhanced Raman scattering (SERS). The theory considers the modulation of the polarizability of a metal nanocluster or a flat metal surface by the vibrational motion of an adsorbed molecule. The modulated polarization of the substrate coupled with the incident light will contribute to the Raman scattering enhancement. We show that for a metal cluster and for a flat metal surface this new chemical contribution may enhance the Raman scattering intensity by a factor of similar to 10(2) and similar to 10(4), respectively. The new SERS process is determined by the electric field parallel to the surface of the metal substrate at the molecular binding site.