Experimental and Theoretical Studies of Molecular Motions inLiquids

Kivelson教授获得了实验物理化学计划的资助，使用实验和理论方法研究液体中的分子运动。特别强调的是研究过冷液体，因为它们接近玻璃化转变温度，和液体系统进行化学反应。当过冷液体接近玻璃化转变温度时，它们变得非常粘稠，弛豫过程变得缓慢，比高温下的低粘度流体更复杂。Kivelson教授的研究小组正在研究小分子和聚合物溶液在玻璃化转变温度附近的行为。此外，其他研究旨在了解反应基团通过周围流体和跨越化学反应激活障碍的运动。这一领域的研究对研究液相中的化学反应具有重要的基础意义。理解这些现象的一般理论框架是由广义流体力学的相关函数描述组成的。Kivelson小组用来研究这些分子运动的主要实验技术是准弹性光散射。

Professor Kivelson is supported by a grant from The Experimental Physical Chemistry Program to study molecular motions in liquids using both experimental and theoretical approaches. Particular emphasis is placed on the study of supercooled liquids as they approach the glass transition temperature, and liquid systems undergoing chemical reaction. As supercooled liquids approach the glass transition temperature they become very viscous, and relaxation processes become slow and more complex than for low viscosity fluids at higher temperatures. Professor Kivelson's research group is studying the behavior of small molecules and polymer solutions near the glass transition temperature. In addition, other studies are aimed at understanding the motion of reacting groups through surrounding fluid and across activation barriers for chemical reactions. This area of research is of fundamental importance to the study of chemical reactions in the liquid phase. The common theoretical framework for understanding these phenomena consists of a correlation function description of generalized hydrodynamics. The primary experimental technique used by Kivelson's group to study these molecular motions is quasielastic light scattering.