CRCU

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (4): 608-611.

• Articles • Previous Articles     Next Articles

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

LI Zhan-long1,2, LI Dong-fei2, SUN Cheng-lin1,2*, LI Zuo-wei2, ZHOU Qiang1, CAO Jun-sheng3 and GAO Feng-li4   

  1. 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 Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012,?P. R. China
  • Received:2010-01-22 Revised:2010-04-12 Online:2010-07-25 Published:2010-10-01
  • Contact: SUN Cheng-lin, E-mail: Chenglin@jlu.edu.cn
  • Supported by:

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

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Abstract: We have determined the Raman scattering cross sections(RSCSs) of β-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 106―107 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.

Key words: Raman scattering cross section, Electron-phonon coupling, Coherent vibration