节点文献

同时计入化学增强和物理增强的SERS模型

SERS Model Taking Both Chemical Enfancement and Physical Enhancement into Consideration

  • 推荐 CAJ下载
  • PDF下载
  • 不支持迅雷等下载工具,请取消加速工具后下载。

【作者】 郭伟立; 张鹏翔;

【Author】 Guo Weili;zhang PengXiang Intitute of Physics,Academic Sinica

【机构】 中国科学院物理研究所; 中国科学院物理研究所;

【摘要】 考虑到分子和金属之间的耦合以及局域场的贡献,我们给出了一个SERS增强因子G的表达式。在我们的处理中,表面等离激元(sp)在吸附中起着重要的作用。从这个表达式可以看出G可分成两部分:短程部分(G1),它起源于分子与金属之间的电荷转移,数量级为102~103;长程部分(G2),它起源于局域场增强,数量级为103~104。分子的SERS活性依赖于以下几个因素:(1)分子的静态偶极矩(D)。(2)分子与金属之间电荷转移的大小。(3)分子的电子结构,金属的SERS活性依赖于:(1)表面等离激元量子(?)ωsp。(2)金属介电函数ε(ω)的虚部。(3)表面粗糙度。

【Abstract】 Taking both the coupling between the molecule and the enhancement of the local field into consideration, we deduced an expression of the enhancement factor (G) for the Surface En- hanced Raman Scattering (SERS). Tn our treatment, the surface plasmon (SP) act as an impor- tant role in adsorption. It is clear from this expression that there are two parts which contribute to the enhancement factor G. The short range one (G1), originating mainly from charge transfer (CT) between the molecule and the metal, turns to be of 102-103. The long range part (G2), orig- inating from local-field enhancement, turns to be 103-104. The SERS activity of the molecule depends on the following facts: (1) the static dipole moment (D) of the molecule. (2) the amount of charge transfer between the molecule and the metal. (3) the electronic structurc or the mole- cule. The SERS activity of the metal depends on: (1) the quanta of the surface plasma (hωsp), (2) the imaginary part of the dielectric constant of the metal. (3) the surface roughness.

【基金】 国家自然科学基金
  • 【文献出处】 Chinese Journal of Chemical Physics ,化学物理学报(英文版) , 编辑部邮箱 ,1989年03期
  • 【被引频次】9
  • 【下载频次】78
节点文献中: 

本文链接的文献网络图示:

本文的引文网络