Polarizability and abnormal infrared spectra of molecules adsorbed on metal nanostructured surfaces  

作　　者：黄晓菁 游荣义 王秀琳 傅小明 朱会丽 

机构地区：[1]Department of Physics,School of Science,Jimei University

出　　处：《Optoelectronics Letters》2010年第6期473-476,共4页光电子快报（英文版）

基　　金：supported by the Natural Science Foundation of Fujian Province of China (Nos. C0710036,T0750008 and B509043A)

摘　　要：Based on the experimental results of abnormal infrared effects(AIREs) for molecules adsorbed on transition-metal nanostructured surfaces,the interactions and the polarizability of the adsorbed molecules are analyzed theoretically.By numerical simulations,the normal absorption spectrum,the Fano-like bipolar spectrum and the anti-absorption spectrum of the adsorbed CO molecules are obtained respectively.The results show that the adsorbed molecules on a metal nanostructured surface can accumulate together dues to the effect of local external electric field,which leads to a change in imaginary part of the molecular polarizability within a certain range of frequency,and even a negative value may appear.Based on the experimental results of abnormal infrared effects（AIREs） for molecules adsorbed on transition-metal nanostructured surfaces,the interactions and the polarizability of the adsorbed molecules are analyzed theoretically.By numerical simulations,the normal absorption spectrum,the Fano-like bipolar spectrum and the anti-absorption spectrum of the adsorbed CO molecules are obtained respectively.The results show that the adsorbed molecules on a metal nanostructured surface can accumulate together dues to the effect of local external electric field,which leads to a change in imaginary part of the molecular polarizability within a certain range of frequency,and even a negative value may appear.

关 键 词：分子纳米结构 异常红外效应 分子极化率 分子吸附 红外光谱 金属表面 布宜诺斯艾利斯 吸收光谱 

分 类 号：O434.3[机械工程—光学工程]