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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Vibrational Relaxation of OH and OD Stretching Vibrations of Phenol and Its Clusters Studied by IR-UV Pump-probe Spectroscopy
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Vibrational Relaxation of OH and OD Stretching Vibrations of Phenol and Its Clusters Studied by IR-UV Pump-probe Spectroscopy

机译：红外-紫外泵浦探针光谱法研究苯酚及其团簇的OH和OD拉伸振动的振动弛豫

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摘要

The vibrational relaxation of the Oh/OD stretching mode of phenol and its cluster with Ar or H_2O has been observed directly by nanosecond IR-UV pump-probe spectroscopy. The OH/OD vibrational level was prepared by a trnable nanosecond IR light pulse, and the decay of the pumped level as well as the rise of the relaxed level were observed by two-photon ionization with a tunable UV laser. For the OH stretch level of phenol-do, two components were observed; a fast component with a decay time of a few nanosedconds and a slwe component with a decay time longer than 1 #mu#s. It was also found that the decay rate of the fast component coincides with that of the rise of relaxed livels. The results indicate that the intramolecular vibrational redistribution (IVR) of the OH stretching vibration of bare phenol-d_o is classified as an intermediatestrong-coupling case. For phenol-d_1, only the slow component was identified for the dacay of the OD stretchin vibration, whereas the relaxed level showed a rise with a few nanoseconds, similar to the case of phenol-d_o. In the case of phenol-Ar and phenol-H_2O, on the other hand, the OH strtching level showed a fast singleexponential decay curve, indicating a transformation from intermediate coupling to the statistical limit upon the cluster formation
机译：纳秒红外-紫外泵浦探针光谱法已直接观察到苯酚及其簇与Ar或H_2O的Oh / OD拉伸模式的振动弛豫。 OH / OD振动能级是通过可调的纳秒IR光脉冲来制备的，而泵浦能级的衰减以及弛豫能级的升高是通过可调谐UV激光器的双光子电离观察到的。对于苯酚的OH拉伸水平，观察到两个成分。衰减时间为几纳秒的快速分量，衰减时间大于1＃mu＃s的slwe分量。还发现快速分量的衰减率与松弛小动物的上升率相吻合。结果表明，裸苯酚-d_o的OH拉伸振动的分子内振动重新分布（IVR）被分类为中等强耦合情况。对于苯酚-d_1，与OD-舒展剂的情况类似，仅OD延伸蛋白振动的导度被确定为缓慢的组分，而松弛水平则显示出上升了几纳秒的时间。另一方面，在苯酚-Ar和苯酚-H_2O的情况下，OH的拉伸水平显示出快速的单指数衰减曲线，表明从中间偶联转变为簇形成时的统计极限

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