Vibrational dynamics of nitromethane mixed with IR780 dye studied by coherent anti-stokes Raman spectroscopy

Vibrational dynamics of nitromethane mixed with IR780 dye studied by coherent anti-stokes Raman spectroscopy
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通过相干反斯托克斯拉曼光谱研究硝基甲烷与 IR780 染料混合的振动动力学

DOI:
10.1002/jrs.4955
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发表时间:
2016-10
影响因子:
2.5
通讯作者:
Yanqiang Yang
Yanqiang Yang
中科院分区:
化学3区
文献类型:
--
作者:
Honglin Wu;Yunfei Song;Guoyang Yu;Xuanlin Chen;Yanqiang Yang

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利用多重相干反斯托克斯拉曼光谱(汽车)研究了混合液体中不同分子间的振动耦合。汽车实验中采用了高时间分辨率的飞秒探针和高光谱分辨率的窄带探针来识别振动相干性。以混合有有机染料IR 780高氯酸盐的液体硝基甲烷(NM)为样品,我们可以清楚地观察到不同振动模式之间的干涉。NM和IR 780分子间的振动相互作用导致了以相位关联变化为形式的振动相干转移(VCT)。与NO2的对称弯曲振动相比,NM的C―N键与IR 780的振动更容易发生相干转移,表明分子间振动相互作用的选择性.这种选择性与分子内运动和分子集体运动的协调有关。版权所有© 2016约翰威利父子有限公司.
Vibrational coupling between different kinds of molecules in liquid mixture is studied by multiplex coherent anti-Stokes Raman spectroscopy (CARS). To identify vibrational coherence, fs-probe with high time resolution and narrowband-probe with high spectral resolution are adopted in CARS experiments. Using liquid nitromethane (NM) mixed with organic dye IR780 perchlorate as the sample, we can clearly observe the interference between different vibrational modes. The intermolecular vibrational interaction between NM and IR780 molecules results in the vibrational coherence transfer (VCT) in the form of a change of phase correlation. Compared with symmetric bending vibration of NO2, coherence transfer is found to be easier to take place between C―N bond of NM and vibrations of IR780, which indicates the selectivity of intermolecular vibrational interaction. The selectivity is deduced to be related to the coordination between intramolecular and collective motion of molecules. Copyright © 2016 John Wiley & Sons, Ltd.
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