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

通过振动光谱和连续波受激布里渊增益光谱研究流体中的分子动力学

• 批准号: 8920029
• 负责人: Richard MacPhail
• 金额: $ 21.19万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-02-01 至 1993-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8920029&HistoricalAwards=false
• 关键词: Molecular; Dynamics; Fluids; Vibrational; Spectroscopy

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.

实验物理化学计划授予Richard A. MacPhail教授用振动光谱学和连续波受激布里因增益光谱学研究流体中的分子动力学。本研究的目的是为液体分子动力学提供新的、更好的数据。振动光谱学用于探测分子的快速形状变化，布里渊技术用于测量许多分子的动力学性质。利用拉曼光谱研究了液体正丁烷扭转振动的阻尼和液体环戊烷的伪旋转动力学。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。这项工作将扩展到环丁烷和环戊烯，它们位于中间势垒区。连续波受激布里渊增益光谱仪是在之前的拨款下开始的，将用于观察过冷液体中的集体动力学，包括甘油、salol和低温光学玻璃。