Selective excitation of molecular mode in a mixture by femtosecond resonance-enhanced coherent anti-Stokes Raman scattering spectroscopy

作     者：He Ping Li Si-Ning Fan Rong-Wei Li Xiao-Hui Xia Yuan-Qin Yu Xin Chen De-Ying 贺平;李思宁;樊荣伟;李晓晖;夏元钦;于欣;陈德应

作者机构：National Key Laboratory of Science and Technology on Tunable LaserInstitute of Opto-electronicsHarbin Insitute of TechnologyHarbin 150080China College of Foundation ScienceHarbin University of CommerceHarbin 150028China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2012年第21卷第2期

页      面：526-530页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：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) the Science and Technology Innovation Foundation,Harbin,China (Grant No.RC2007QN017030) 

主　　题：ultrafast spectroscopy coherent anti-Stokes Raman scattering vibrational analysis resonance enhancement 

摘      要：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 femtoseeond time resolved CARS spectroscopy, showing that an effective method of suppressing the non-resonant CARS background and other interferences is demonstrated.