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Structural deformation of nitro group of nitromethane molecule in liquid phase in an intense femtosecond laser field |
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| Affiliation: | 1.College of Science, Heilongjiang Bayi Agricultural University, Daqing 163319, China;2.Department of Physics, Harbin Institute of Technology, Harbin 150001, 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 of NO2 group induced by an intense femtosecond laser field of liquid nitromethane (NM) molecule is detected by time- and frequency-resolved coherent anti-Stokes Raman spectroscopy (CARS) technique with the intense pump laser. Here, we present the mechanism of molecular alignment and deformation. The CARS spectra and its FFT spectra of liquid NM show that the NO2 torsional mode couples with the CN symmetric stretching mode and that the NO2 group undergoes ultrafast structural deformation with a relaxation time of 195 fs. The frequency of the NO2 torsional mode in liquid NM (50.8±0.3 cm-1) at room temperature is found. Our results prove the structural deformation of two groups in liquid NM molecule occur simultaneously in the intense laser field. |
| Keywords: | coherent anti-Stokes Raman spectroscopy (CARS) spectra structural deformation intense laser field liquid nitromethane |
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