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Selective excitation of molecular mode in a mixture by femtosecond resonance-enhanced coherent anti-Stokes Raman scattering spectroscopy |
He Ping(贺平)a)b), Li Si-Ning(李思宁)a), Fan Rong-Wei(樊荣伟)a), Li Xiao-Hui(李晓晖)a), Xia Yuan-Qin(夏元钦)a), Yu Xin(于欣)a), and Chen De-Ying(陈德应)a)† |
a. National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, China;
b. College of Foundation Science, Harbin University of Commerce, Harbin 150028, China |
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Abstract Femtosecond time-resolved coherent anti-Stokes Raman scattering (CARS) spectroscopy is used to investigate gaseous molecular dynamics. Due to the spectrally broad laser pulses, usually poorly resolved spectra result from this broad spectroscopy. However, it can be demonstrated that by the electronic resonance enhancement optimization control a selective excitation of specific vibrational mode is possible. Using an electronically resonance-enhanced effect, iodine molecule specific CARS spectroscopy can be obtained from a mixture of iodine-air at room temperature and a pressure of 1 atm (corresponding to a saturation iodine vapour as low as about 35 Pa). The dynamics on either the electronically excited state or the ground state of iodine molecules obtained is consistent with previous studies (vacuum, heated and pure iodine) in the femtosecond time resolved CARS spectroscopy, showing that an effective method of suppressing the non-resonant CARS background and other interferences is demonstrated.
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Received: 04 March 2011
Revised: 28 April 2011
Accepted manuscript online:
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PACS:
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78.47.J-
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(Ultrafast spectroscopy (<1 psec))
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42.65.Dr
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(Stimulated Raman scattering; CARS)
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33.20.Tp
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(Vibrational analysis)
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33.35.+r
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(Electron resonance and relaxation)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60878018 and 61008023), the Natural Scientific Research Innovation Foundation in Harbin Institute of Technology, China (Grant No. HIT.NSRIF.2009009), and the Science and Technology Innovation Foundation, Harbin, China (Grant No. RC2007QN017030). |
Corresponding Authors:
Chen De-Ying,dychen@hit.edu.cn
E-mail: dychen@hit.edu.cn
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Cite this article:
He Ping(贺平), Li Si-Ning(李思宁), Fan Rong-Wei(樊荣伟), Li Xiao-Hui(李晓晖), Xia Yuan-Qin(夏元钦), Yu Xin(于欣), and Chen De-Ying(陈德应) Selective excitation of molecular mode in a mixture by femtosecond resonance-enhanced coherent anti-Stokes Raman scattering spectroscopy 2012 Chin. Phys. B 21 027801
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