Tracking molecular structure deformation of nitrobenzene and its torsion-vibration coupling by intense pumping CARS |
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Affiliation: | 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 |
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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 NO_2 torsional mode couples with the NO_2 symmetric stretching mode,and the NB molecule undergoes ultrafast structural deformation with a relaxation time of 265 fs.The frequency of NO_2 torsional mode in liquid NB(42 cm~(-1)) at room temperature is found from the sum and difference combination bands involving the NO_2 symmetric stretching mode and torsional mode in time- and frequency-resolved CARS spectra. |
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Keywords: | oherent anti-Stokes Raman spectroscopy structural deformation liquid nitrobenzene |
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