Effect of CC Coherent Vibration on Relative Raman Scattering Cross Sections of All-trans β-Carotene  

作　　者：LI Zhan-long LI Dong-fei SUN Cheng-lin LI Zuo-wei ZHOU Qiang CAO Jun-sheng GAO Feng-li 

机构地区：[1]State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China [2]College of Physics, Jilin Universty, Changchun 130021, P. R. China [3]Lab of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P R. China [4]State Key Laboratory of lntegrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P R. China

出　　处：《Chemical Research in Chinese Universities》2010年第4期608-611,共4页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.10774057);the Foundation of Jilin Provincial Science & Technology Department,China(No.20090534);the Opened Fund of State Key Laboratory of Integrated Optoelectronics, China(No.IOSKL-KF200908)

摘　　要：We have determined the Raman scattering cross sections（RSCSs） of fl-carotene for C=C and C-C stretching modes, with the 1444 cm^-1 Raman band of cyclohexane as internal standard, in different solvents at low concentrations by measuring Raman intensity. The results show that RSCSs of β-carotene were 10^6-10^7 times larger than the general RSCSs, we analyzed that this enhancement was caused not only by the resonance Raman effect but also by nonlinear coherent CC vibration in aqueous β-carotene. Moreover, overtone and combinations of it were also observed and their intensities were 10%-20% of those of their fundamentals when β-carotene was dissolved in non-polar solvents, respectively.We have determined the Raman scattering cross sections（RSCSs） of fl-carotene for C=C and C-C stretching modes, with the 1444 cm^-1 Raman band of cyclohexane as internal standard, in different solvents at low concentrations by measuring Raman intensity. The results show that RSCSs of β-carotene were 10^6-10^7 times larger than the general RSCSs, we analyzed that this enhancement was caused not only by the resonance Raman effect but also by nonlinear coherent CC vibration in aqueous β-carotene. Moreover, overtone and combinations of it were also observed and their intensities were 10%-20% of those of their fundamentals when β-carotene was dissolved in non-polar solvents, respectively.

关 键 词：Raman scattering cross section Electron-phonon coupling Coherent vibration 

分 类 号：O613.71[理学—无机化学] TQ466.1[理学—化学]