Ultrafast Spectroscopy and Other Applications of Lasers in Chemistry

超快光谱学和激光在化学中的其他应用

• 批准号: 9103225
• 负责人: Robin Hochstrasser
• 金额: $ 82.79万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9103225&HistoricalAwards=false
• 关键词: Ultrafast; Spectroscopy; Other; Applications; Lasers

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.

在化学学部实验物理化学项目的这个项目中，Hochstrasser将使用飞秒激光脉冲研究凝聚态中的超快分子动力学，以获得可见光和红外光谱。这些实验的主题是在液体中受碰撞影响的分子中的能量流动，以及分子中能量向周围环境的流动。研究的三个领域是多烯的扭转弛豫，质子转移反应，反应性和非反应性振动弛豫。在碰撞本身的时间尺度上，对液相中的碰撞诱导过程进行了检验。研究凝聚态中能量激发的分子从一种分子异构体结构向另一种分子异构体结构的转变，将大大扩展我们对复杂分子如何经历内部重排以及这些重排是如何由周围溶剂介导的认识。