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Chin. Phys. B, 2016, Vol. 25(11): 114210    DOI: 10.1088/1674-1056/25/11/114210
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Tracking molecular structure deformation of nitrobenzene and its torsion vibration coupling by intense pumping CARS

Chang Wang(王畅)1,2, Hong-Lin Wu(吴红琳)1, Yun-Fei Song(宋云飞)3, Xing He(何兴)1, Yan-Qiang Yang(杨延强)1,3, Duo-Wang Tan(谭多旺)3
1 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 College of Science, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
3 National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Abstract  

The structural deformation induced by intense laser field of liquid nitrobenzene (NB) molecule, a typical molecule with restricting internal rotation, is tracked by time- and frequency-resolved coherent anti-Stokes. Raman spectroscopy (CARS) technique with an intense pump laser. The CARS spectra of liquid NB show that the NO2 torsional mode couples with the NO2 symmetric stretching mode, and the NB molecule undergoes ultrafast structural deformation with a relaxation time of 265 fs. The frequency of NO2 torsional mode in liquid NB (42 cm-1) at room temperature is found from the sum and difference combination bands involving the NO2 symmetric stretching mode and torsional mode in time- and frequency-resolved CARS spectra.

Keywords:  oherent anti-Stokes Raman spectroscopy      structural deformation      liquid nitrobenzene  
Received:  01 June 2016      Revised:  30 September 2016      Accepted manuscript online: 
PACS:  42.65.Dr (Stimulated Raman scattering; CARS)  
  33.20.Vq (Vibration-rotation analysis)  
  61.25.Em (Molecular liquids)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 21173063 and 21203047), the Foundation of Heilongjiang Bayi Agricultural University, China (Grant No. XZR2014-16), NSAF (Grant No. U1330106), and the Special Research Project of National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics (Grant No. 2012-S-07).

Corresponding Authors:  Yan-Qiang Yang     E-mail:  yqyang@hit.edu.cn

Cite this article: 

Chang Wang(王畅), Hong-Lin Wu(吴红琳), Yun-Fei Song(宋云飞), Xing He(何兴), Yan-Qiang Yang(杨延强), Duo-Wang Tan(谭多旺) Tracking molecular structure deformation of nitrobenzene and its torsion vibration coupling by intense pumping CARS 2016 Chin. Phys. B 25 114210

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