Resonance Emission Studies of Intra- and Intermolecular Ultrafast Dynamics

分子内和分子间超快动力学的共振发射研究

• 批准号: 9316148
• 负责人: Lawrence Ziegler
• 金额: --
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-12-15 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316148&HistoricalAwards=false
• 关键词: Resonance; Emission; Studies; Intra; Intermolecular

9316148 Ziegler In this project of the Experimental Physical Chemistry Program in the Chemistry Divison, Prof. L. Ziegler of Boston University will extend previous studies of ultrafast dynamics in isolated molecules to the condensed phase and clusters, so as to study the effects of the embedding bath on processes in the excited electronic state of the molecule. Spontaneous Raman and fluorescence light scattering techniques will be used to 1) probe the time scales, amplitudes and motional character of solvent/bath descriptions and to determine microscopic details of how these degrees of freedom couple to electronic excita- tions, and 2) how the bath interactions affect the photo- chemical dynamics of the quasi-bound excited state photodisso- ciation of these chromophores. Well characterized molecules embedded in clusters, solutions, and high pressure gases will be investigated. Resonance lineshapes, depolarization ratios, and quantum yields will be measured to determine the vibrational and rotational level dependent dephasing and relaxation rates. Chemical reactions usually require the elevation of molecules to excited states of energy. Since the chemistry of molecules under conditions of high pressure, in solution, or embedded in a solid matrix or in a cluster is affected by their environment, it is important to know and understand these changes in order improve the technology based on chemical reactions. The research undertaken in this project will provide a data base and theoretical model for the reaction kinetics and dynamics of well characterized molecules which are embedded in a condensed phase medium. ***

9316148在化学分区实验物理化学计划项目中的Ziegler，波士顿大学的L. Ziegler教授将将对分离分子中超快动态的先前研究扩展到凝结相位和簇，以研究嵌入浴对激发浴的影响的嵌入式浴的影响。自发性拉曼和荧光散射技术将用于1）探测溶剂/浴室描述的时间尺度，幅度和运动特征，并确定这些自由度夫妇对电子激励的微观细节以及2）如何影响浴室的浴室相互作用的光学动力学兴奋的态度，这些型号的化学动力学兴奋了。将研究嵌入簇，溶液和高压气体中的良好表征分子。共振线路，去极化比和量子产率将测量以确定振动和旋转水平依赖性的脱位和放松速率。化学反应通常需要分子升高到激发能量态。由于在高压条件下，溶液或嵌入固体基质或集群中的分子化学性质受其环境的影响，因此了解和理解这些变化以改善基于化学反应的技术很重要。该项目中进行的研究将为嵌入在冷凝相培养基中的良好特征分子的反应动力学和动力学提供数据库和理论模型。 ***