Dynamics of Electronically Excited States: Models for Chemical Reactivity

在该项目中，美国匹兹堡大学化学系的David Pratt教授将进行一系列实验，旨在确定几种大分子及其弱结合溶质-溶剂配合物在气相中的三维结构和动力学性质。为此，将结合超声速膨胀、连续波分子束、单频紫外激光、空间选择性荧光检测和高速数据采集等技术，获得与生命过程物理化学相关的几种系统的高分辨率电子光谱。在样品上施加电场，可以测量结合电子态中的永久电偶极矩。要解决的具体问题是系统间交叉动力学中的扭转模式，四烯范德华配合物中氦原子的运动，取代萘之间气相形成的杂合物的几何形状，以及其他主题。研究生和本科生以及博士后研究助理将参与本研究。将密切关注未来K-12理科课程教师的培养。本研究项目的参与者将获得当代物理化学的宝贵技能和知识，以及在计划和执行研究计划方面的培训。

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Prof. David Pratt of the Department of Chemistry of the University of Pittsburgh will conduct a series of experiments designed to determine the three-dimensional structures and dynamical properties of several large molecules and their weakly bound solute-solvent complexes in the gas phase. To this end, high-resolution electronic spectra of several systems relevant to the physical chemistry of life processes will be obtained by combining the techniques of supersonic expansions, cw molecular beams, single frequency UV lasers, spatially selective fluorescence detection, and high-speed data acquisition. The application of electric fields to the sample will make possible the measurement of the permanent electric dipole moments in the combining electronic states. Specific problems to be addressed are the torsional modes in intersystem crossing dynamics, the motion of helium atoms in van der Waals complexes of tetracene, the geometries of exiplexes formed in the gas phase between substituted naphthalenes, as well as other topics.Graduate and undergraduate students, as well as postdoctoral research associates will participate in this research. Close attention will be paid to the training of future teachers of K-12 science courses. The participants in this research project will gain valuable skills and knowledge in contemporary physical chemistry, as well as training in the planning and execution of research programs.