Changing Vibration Coupling Strengths of Liquid Acetonitrile with an Angle-Tuned Etalon
Changing Vibration Coupling Strengths of Liquid Acetonitrile with an Angle-Tuned Etalon
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DOI：
10.1021/acs.jpcb.1c01758
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发表时间：
2021-07-26
影响因子：
3.3
通讯作者：
Coe, James, V
中科院分区：
文献类型：
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作者：
Erwin, Justin D.;Wang, Ying;Coe, James, V
这项工作是第一篇关于红外腔振动实验中非零分子振动耦合的报告。振动-振动耦合强度由平行间隔反射镜（标准具模式或条纹）的腔模式在费米耦合的液体乙腈的两个振动之间的区域中进行角度调谐来确定，即 CN 拉伸主导的振动和由对称 CH3 弯曲和 C-C 拉伸主导的附近组合带。迄今为止，涉及多种振动的所有其他红外空腔振动工作均使用零值进行振动-振动耦合；然而，这项工作从费米耦合振动开始，并揭示了当腔模式在相互作用的振动之间进行角度调谐时，振动-振动耦合和腔-振动耦合会发生变化。改变腔内基本振动动力学的能力是一个令人兴奋的结果，它有助于为理解平行板标准具腔中的分子振动动力学奠定基础。
This work is the first report on nonzero molecular vibration-vibration coupling in an infrared cavity-vibration experiment. Vibration-vibration coupling strength is determined as a cavity mode of parallel spaced mirrors (etalon mode or fringe) is angle-tuned in the region between two vibrations of liquid acetonitrile which are Fermi coupled, namely, a CN stretch dominated vibration and a nearby combination band dominated by the symmetric CH3 bend and C-C stretch. All other infrared cavity-vibration work to date involving more than one vibration has used a value of zero for vibration-vibration coupling; however, this work starts with Fermi coupled vibrations and reveals that there are changes in the vibration-vibration coupling and cavity-vibration couplings as the cavity mode is angle-tuned between the interacting vibrations. The ability to change fundamental vibrational dynamics within a cavity is an exciting result which helps to build a foundation for understanding molecular vibrational dynamics in parallel plate etalon cavities.