Ultrafast Spectroscopy and Other Applications of Lasers in Chemistry

在化学部实验物理化学计划的这个项目中，Hochstrasser将使用飞秒激光脉冲研究凝聚相中的超快分子动力学，以获得可见光和红外光谱。这些实验的主题是分子中易受液体碰撞的能量流动，以及从分子中流出的能量流入周围环境。研究的三个领域是多烯的扭转松弛，质子转移反应，以及反应性和非反应性振动松弛。碰撞诱导的过程是在碰撞本身的时间尺度上在液体中被检查的。研究凝聚相中高能激发分子从一种分子同分异构体到另一种分子同分异构体构型的转换，将极大地扩展我们对复杂分子如何进行内部重排和它们是如何通过周围的溶剂来调节的。

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Hochstrasser will study ultrafast molecular dynamics in condensed phases using femtosecond laser pulses to obtain spectra in the visible and infrared. Energy flow in molecules which are subject to collisions in a liquid and the flow of the energy out of the molecule into the surroundings are the subject of these experiments. Three areas of study are torsional relaxation of polyenes, proton transfer reactions, and reactive and nonreactive vibrational relaxation. The collisionally induced processes are examined in the liquid phase on the time scale of collisions themselves. %%% The study of the transformation of energetically excited molecules in condensed phases from one molecular isomeric configuration to another will significantly expand our knowledge of how a complex molecule undergoes internal rearrangements and how these are mediated by a surrounding solvent.