Coherent coupling between vibrational modes of C–H bonds at different positions studied by femtosecond time-resolved coherent anti-Stokes Raman scattering

doi:10.1088/1674-1056/21/3/034210

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

Received: 14 September 2011
Revised: 11 October 2011
Accepted manuscript online:

PACS:	42.65.Dr	(Stimulated Raman scattering; CARS)
	42.50.Md	(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
	78.47.J-	(Ultrafast spectroscopy (<1 psec))
	78.47.je	(Time resolved light scattering spectroscopy)

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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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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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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