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

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【Author】 Chang Wang;Hong-Lin Wu;Yun-Fei Song;Xing He;Yan-Qiang Yang;Duo-Wang Tan;Department of Physics, Harbin Institute of Technology;College of Science, Heilongjiang Bayi Agricultural University;National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics,China Academy of Engineering Physics;

【机构】 Department of Physics, Harbin Institute of Technology； College of Science, Heilongjiang Bayi Agricultural University； National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics,China Academy of Engineering Physics；

【摘要】 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.更多还原

【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.更多还原

【关键词】 coherent anti-Stokes Raman spectroscopy； structural deformation； liquid nitrobenzene；
【Key words】 coherent anti-Stokes Raman spectroscopy； structural deformation； liquid nitrobenzene；

【基金】 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);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)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2016年11期

【分类号】TN24
【被引频次】1
【下载频次】21

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