trafast Photodissociation and Dephasing Dynamics of all Molecules in Solution

在化学部实验物理化学计划的这个项目中，将进行光谱学研究，以研究溶剂对几个小分子电子态的影响。将使用时间相关和稳态技术，包括皮秒泵浦-探测吸收动力学和共振拉曼光谱。过去的工作已经探索了气相中的分子，但拟议的实验将集中在凝聚相上。时间分辨实验将有助于阐明溶剂-溶质相互作用的一些动态方面。数据将被用来批判性地检验和扩展现有的理论模型。将使用的光谱技术范围将提供有关正在研究的系统的许多方面的信息。这项关于气相和溶液中物种性质差异的研究是新颖的，因为它集中在小分子上，与通常在溶液中用光谱研究的大分子相比，小分子更容易进行理论分析和预测。此外，可以将液相结果与现有的气相数据进行比较，以确定在凝聚介质中发生了什么性质变化。这些研究很重要，因为所有生物、环境和技术上重要的化学物质中有很大一部分是在液体中发生的。

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, spectroscopic studies will be performed to investigate the effects of a solvent on the electronic states of several small molecules. Both time-dependent and steady-state techniques will be used, including picosecond pump-probe absorption kinetics and resonance Raman spectroscopy. Past work has explored the molecules in the gas phase, but the proposed experiments will concentrate on the condensed phase. The time- resolved experiments will help illuminate some of the dynamic aspects of the solvent-solute interactions. Data will be used to critically test and extend existing theoretical models. The range of spectroscopic techniques to be used will provide information on many aspects of the systems under study. %%% This study of the differences in properties of species in the gas phase versus in solution is novel in that it concentrates on small molecules, which are more tractable to theoretical analysis and prediction than the large molecules commonly studied spectroscopically in solution. Furthermore, the liquid-phase results can be compared with existing gas-phase data to determine what changes in properties occur in the condensed medium. These studies are important since a large fraction of all biologically, environmentally, and technologically important chemistry occurs in liquids.