Selective excitation of molecular mode in a mixture by femtosecond resonance-enhanced coherent anti-Stokes Raman scattering spectroscopy |
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| Authors: | He Ping Li Si-Ning Fan Rong-Wei Li Xiao-Hui Xia Yuan-Qin Yu Xin and Chen De-Ying |
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| Institution: | National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, China;College of Foundation Science, Harbin University of Commerce, Harbin 150028, China;National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, China;National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, China;National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, China;National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, China;National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, China;National Key Laboratory of Science and Technology on Tunable Laser, Institute of Opto-electronics, Harbin Insitute of Technology, Harbin 150080, 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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| Keywords: | ultrafast spectroscopy coherent anti-Stokes Raman scattering vibrational analysis resonance enhancement |
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