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Coherent coupling between vibrational modes of Cben H bonds at different positions studied by femtosecond time-resolved coherent anti-Stokes Raman scattering |
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| Authors: | Du Xin He Xing Liu Yu-Qiang Wang Ying-Hui and Yang Yan-Qiang |
| Institution: | Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150080, China;College of Foundation Science, Harbin University of Commerce, Harbin 150028, China;Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150080, China;Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150080, China;Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150080, China;Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150080, China |
| Abstract: | We performed femtosecond time-resolved coherent anti-Stokes Raman scattering (fs-CARS) measurements on liquid toluene and PVK film. For both samples, we selectively excited the CH stretching vibrational modes and observed the expected quantum beat signals. The frequency of the well-defined beats is in good agreement with the energy difference between the two simultaneously excited modes, which demonstrates that a coherent coupling between the vibrational modes of the C-H chemical bonds exists at the different positions of the molecules. The dephasing times of the excited modes are obtained simultaneously. |
| Keywords: | femtosecond time-resolved coherent anti-Stokes Raman scattering coherent coupling quantum beat |
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