Femtosecond Studies of the Influence of Solvent on Chemical Reaction Dynamics

溶剂对化学反应动力学影响的飞秒研究

• 批准号: 9817835
• 负责人: Stephen Bradforth
• 金额: $ 27.83万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-15 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9817835&HistoricalAwards=false
• 关键词: Femtosecond; Studies; Influence; Solvent; Chemical

Bradforth is supported by the Experimental Physical Chemistry Program to use ultrafast spectroscopic methods to explore the role and magnitude of the solvent effect on chemical reaction dynamics in solution. The following studies will be carried out: (1) electron photodetachment via transitions to charge transfer to solvent states (CTTS), and (2) solution photodissociation of neutral molecules for which the isolated molecule dynamics have been extensively characterized both experimentally and theoretically. A newly developed 50 femtosecond tunable light source in the photochemically important 245-350 nanometer region will allow benchmark chemical systems to be examined. In addition, new graduate level courses that incorporate spectroscopy and molecular dynamics in the time domain will be developed. Outcomes from the research effort are expected to permit quantitative comparisons to theory, forming a basis for understanding the details of chemical reactions in solution. Much important chemistry takes place in liquids. When chemical reactions occur in liquid solutions, the liquid that surrounds the reacting molecules can affect the reaction outcomes significantly. In this project, solution chemistry will be examined on the timescales of atomic motion in molecules. Results from this project will lead to new insights into how molecules react in water and other liquids.

布拉德福斯得到了实验物理化学计划的支持，该计划使用超快光谱方法来探索溶剂对溶液中化学反应动力学的作用和大小。将开展以下研究：(1)通过电荷转移到溶剂态(CTTS)的电子光解离；(2)中性分子的溶液光解离，其孤立的分子动力学已被广泛地从实验和理论上表征。在具有光化学重要性的245-350纳米区域，新开发的50飞秒可调光源将允许检查基准化学系统。此外，还将开发新的研究生水平课程，将光谱学和分子动力学纳入时间域。研究成果有望与理论进行定量比较，为理解溶液中化学反应的细节奠定基础。许多重要的化学作用都发生在液体中。当化学反应在液体溶液中发生时，反应分子周围的液体会对反应结果产生重大影响。在这个项目中，溶液化学将在分子中原子运动的时间尺度上进行研究。该项目的结果将导致对分子在水和其他液体中如何反应的新见解。