ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Coherent coupling between vibrational modes of C–H bonds at different positions studied by femtosecond time-resolved coherent anti-Stokes Raman scattering |
Du Xin(杜鑫)a)b), He Xing(何兴)a), Liu Yu-Qiang(刘玉强)a), Wang Ying-Hui(王英惠)a), and Yang Yan-Qiang(杨延强)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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Received: 14 September 2011
Revised: 11 October 2011
Accepted manuscript online:
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PACS:
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42.65.Dr
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(Stimulated Raman scattering; CARS)
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42.50.Md
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(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
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78.47.J-
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(Ultrafast spectroscopy (<1 psec))
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78.47.je
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(Time resolved light scattering spectroscopy)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 20573028 and 20973050). |
Corresponding Authors:
Yang Yan-Qiang,yqyang@hit.edu.cn
E-mail: yqyang@hit.edu.cn
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Cite this article:
Du Xin(杜鑫), He Xing(何兴), Liu Yu-Qiang(刘玉强), Wang Ying-Hui(王英惠), and Yang Yan-Qiang(杨延强) Coherent coupling between vibrational modes of C–H bonds at different positions studied by femtosecond time-resolved coherent anti-Stokes Raman scattering 2012 Chin. Phys. B 21 034210
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