Ultrafast Studies of Energy Redistribution in Condensed Phase Chemical Reactions

凝聚相化学反应中能量再分配的超快研究

基本信息

批准号：
0078972
负责人：
Roseanne Sension
金额：
$ 32.85万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2000
资助国家：
美国
起止时间：
2000-08-01 至 2006-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0078972&HistoricalAwards=false
关键词：
Ultrafast Studies Energy Redistribution Condensed

项目摘要

Professor Roseanne Sension of the University of Michigan is funded by the Experimental Physical Chemistry program to perform experiments on energy redistribution in condensed phase chemical reactions. The reason why these studies are of interest is two-fold: first, understanding the interplay between energy relaxation and chemical reactions in the liquid phase is important in biological processes. Secondly, prospects of coherent control of reactions would be another important outcome. This proposal seeks to study the rate and extent of intramolecular vibrational relaxation in polyatomic molecules such as hexatriene, cyclohexadiene and dehydrocholesterol in solution. The PI then proposes to examine the nature of the interactions between a hot molecule and the solvent. A successful outcome of this proposal would be a model used to predict, interpret and/or control the outcome of chemical reactions in solution. The proposed work is unique because of the PI's ability to produce 30 fs pulses in the deep ultraviolet. Studying the pathways that energy flows through molecules and the flow rates provides information that is directly applicable to biological processes such as photosynthesis and vision. The use of ultrashort laser pulses in the deep ultraviolet makes small molecules accessible to these studies. It is thought that the first demonstrations of coherent control of reactions in solution will be in small molecules, since there are fewer pathways available to disperse the energy and, thus, it is more likely that the energy can be driven to the reaction of interest (bond breaking, for example.) These fundamental studies take advantage of recent advances in laser pulse generation that make possible the new field of femtochemistry.

密歇根大学的Roseanne Sension教授是由实验物理化学计划资助的，可以在凝结相化学反应中进行有关能量再分配的实验。这些研究引起的研究是两个方面：首先，了解液相中能量松弛与化学反应之间的相互作用在生物过程中很重要。其次，对反应的一致控制的前景将是另一个重要的结果。该提案旨在研究多原子分子（例如六丁则，环己二烯和溶液中脱氢胆固醇）中分子内振动弛豫的速率和程度。然后，PI建议检查热分子与溶剂之间相互作用的性质。该提案的成功结果将是用于预测，解释和/或控制溶液中化学反应结果的模型。拟议的工作是独一无二的，因为PI能够在深紫外线中产生30 FS脉冲。研究能量流经分子的途径和流速提供了直接适用于光合作用和视力等生物学过程的信息。在深紫外线中使用超短激光脉冲使这些研究可以访问小分子。人们认为，解决方案反应的连贯控制的第一个证明将是小分子，因为可以使用较少的途径来传播能量，因此，更有可能将能量驱动到感兴趣的反应（例如断裂，例如断裂）。这些基本研究利用了Laser Pless Generation在Laser Perse Generation中的最新进展，使得FELSER INFERS可以使Femter Chemter of FemterChem Chem Chem of Femter Chem Chem Chem Chem Chem Chem Chem of Femter Chem Chem Chem Chem Chem Chem Chem Chem Chem Chem Chem Chem Chem Chem of Femter Chemsistion。