%A 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) %T Tracking molecular structure deformation of nitrobenzene and its torsion vibration coupling by intense pumping CARS %0 Journal Article %D 2016 %J Chin. Phys. B %R 10.1088/1674-1056/25/11/114210 %P 114210-114210 %V 25 %N 11 %U {https://cpb.iphy.ac.cn/CN/abstract/article_119123.shtml} %8 2016-11-05 %X

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.