Molecular Dynamics in Fluids by Vibrational Spectroscopy andCW Stimulated Brillouin Gain Spectroscopy

实验物理化学计划授予理查德·A·麦克菲尔教授利用振动光谱和连续波受激布里渊增益光谱研究流体中分子动力学的奖项。这项研究的目的是为液体中的分子动力学提供新的和更好的数据。振动光谱被用来探测分子的快速形状变化，布里渊技术被用来测量许多分子的动力学性质。用拉曼光谱研究了液体正丁烷中扭转振动的衰减和液体环戊烷中的假旋转动力学。在振动时间尺度上，这两种情况对应于液体中单分子反应的高势垒和低势垒极限。这项工作将扩展到处于中间势垒区域的环丁烷和环戊烯。连续波受激布里渊增益谱仪，根据先前的资助开始，将被用来观察过冷液体中的集体动力学，包括甘油、沙洛尔和低温光学玻璃。

The Experimental Physical Chemistry Program has made an award to Professor Richard A. MacPhail to study molecular dyanamics in fluids by vibrational spectroscopy and CW stimulated Brillouin gain spectroscopy. The goal of this research is to provide new and better data on molecular dynamics in liquids. Vibrational spectroscopy is used to probe rapid shape changes in molecules and the Brillouin technique is used to measure dynamical properties over many molecules. Raman spectroscopy is to be employed to probe the damping of torsional vibrations in liquid n-butane and pseudorotation dynamics in liquid cyclopentane. On the vibrational timescale, these two cases correspond to the high barrier and low barrier limits of unimolecular reactions in liquids. This work will be extended to cyclobutane and cyclopentene, which lie in the intermediate barrier regime. The CW stimulated Brillouin gain spectrometer, begun under the previous grant, will be used to observe collective dynamics in supercooled liquids, including glycerol, salol and low temperature optical glass.