天线共振子理论对吡啶分子在铁钴镍衬底上SERS增强因子的计算

天线共振子模型是在研究表面增强拉曼散射增强机理过程中提出的理论.作为一项非常具有代表意义的工作,文章利用天线共振子模型计算了吡啶分子1010 cm-1特征振动模在过渡金属Fe,Co,Ni衬底上的表面增强拉曼散射增强因子:给出了共振时三种金属增强因子与激发光能量的依赖关系;研究了它们的表面粗糙度对增强因子的影响,计算了能量为0.89 eV的入射光在不同表面粗糙度的三种金属衬底上的增强因子.计算结果表明,它们在可见光范围增强因子不大,这与已报道的实验结果一致;但在红外波长却有大的增强因子,可以达到104～107,有待实验检验.

Calculation of the SERS Enhancement Factors of Pyridine Molecules Adsorbed on the Substrates of Fe, Co and Ni Using Antenna Resonace Model

The theory of antenna resonance model is a theory advanced in the investigation of the mechanism of surface enhanced Raman scattering. In the present paper, as a representational example the authors have calculated the enhancement factors of the vibrational mode 1 010 cm -1 of pyridine molecules adsorbed on the metal substrates of Fe, Co and Ni through this model. The dependence of the enhancement factor of Raman scattering on different incident energy at resonance was studied and that on surface roughness of the three metals with the excitation of 0.89 eV was brought forward. As a result, the enhancement factors in visible region are small, but they are rather large (104-107) in infrared region.