Coherent coupling between vibrational modes of C-H bonds at different positions studied by femtosecond time-resolved coherent anti-Stokes Raman scattering |
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Authors: | Du Xin ab He Xing a Liu Yu-Qiang a Wang Ying-Hui a and Yang Yan-Qiang |
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Institution: | a) a) Center for Condensed Matter Science and Technology,Department of Physics,Harbin Institute of Technology,Harbin 150080,China b) College of Foundation Science,Harbin University of Commerce,Harbin 150028,China |
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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. |
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Keywords: | femtosecond time-resolved coherent anti-Stokes Raman scattering coherent coupling quantum beat |
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