Liu Xiaosong, Song Yunfei, Zhang Wei, Zhu Gangbei, Lv Zhe, Liu Weilong, Yang Yanqiang
Department of Physics, Harbin Institute of Technology Harbin China.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics Mianyang China
RSC Adv. 2018 Aug 23;8(52):29775-29780. doi: 10.1039/c8ra04979c. eCollection 2018 Aug 20.
Selective excitation of C-H, C-C, CX and CX stretching vibrational modes in an orderly manner, detection of intramolecular energy redistribution and vibrational coupling in the electronic ground state of aryl halides are performed by time- and frequency-resolved Coherent Anti-Stokes Raman Scattering (CARS) spectroscopy. Intramolecular energy flow from parent modes to daughter modes is observed in the experiment. According to the experimental results, it is found that the up-hill vibrational energy flow from lower frequency modes to higher frequency ones is counterintuitive and energy redistribution efficiencies are controlled by the mass of the halide. The selectivity and directionality of energy flow are also discussed in view of vibrational symmetry.
通过时间分辨和频率分辨的相干反斯托克斯拉曼散射（CARS）光谱，以有序方式选择性激发芳基卤化物电子基态中的C-H、C-C、CX和CX伸缩振动模式，检测分子内的能量重新分布和振动耦合。实验中观察到了从母模式到子模式的分子内能量流动。根据实验结果，发现从低频模式到高频模式的上坡振动能量流动违反直觉，并且能量重新分布效率受卤化物质量控制。还从振动对称性的角度讨论了能量流动的选择性和方向性。
