Spectroscopic Determinations of Excited State Properties of Organometallic and Inorganic Compounds

四种方法将用于研究含金属分子在从低温单晶到气相的条件下的电子激发态。第一组实验是利用单晶偏振光谱对激发态进行详细的分配。程序的第二个组成部分是确定激发态畸变从电子光谱的振动结构。实验将重点研究超声速自由膨胀射流在冷无碰撞条件下以及在凝聚态介质中分子的发射和激发光谱。第三组实验将通过分析共振拉曼激发谱来确定激发态畸变。因此，即使电子谱很宽且无特征，激发态也可以逐模检测。最后，利用激发态泵浦探测拉曼光谱测量激发态分子的几何形状。所有实验的目标是统一理解激发态轨道特性、潜在表面位移和金属化合物的几何形状。在化学学部无机、生物无机和有机金属项目的这个项目中，加州大学洛杉矶分校的Jeffrey I. Zink博士将继续研究用光谱方法测定含金属分子的激发态特性。这些研究为理解许多光化学过程提供了至关重要的基础信息，在这些过程中，阳光被用作能量来源。

Four approaches will be used to investigate the electronic excited states of metal-containing molecules under conditions ranging from single crystals at low temperatures to the gas phase. The first group of experiments is the detailed assignment of excited states by using single crystal polarized spectroscopy. The second component of the program is the determination of excited state distortions from vibronic structure in electronic spectra. The experiments will focus on emission and excitation spectra of molecules in the cold collision-free conditions of a supersonic free expansion jet as well as in condensed media. The third group of experiments will determine excited state distortions from analysis of resonance Raman excitation profiles. Thus, the excited states can be examined mode by mode even when the electronic spectrum is broad and featureless. Finally, the geometries of molecules in excited states will be measured by using excited state pump-probe Raman spectroscopy. The goal of all of the experiments is the unified understanding of excited state orbital characteristics, potential surface displacements and geometries of metal compounds. %%% In this project in the Inorganic, Bioinorganic, and Organometallic Program of the Chemistry Division, Dr. Jeffrey I. Zink of the University of California at Los Angeles will continue studies of the determinations of excited state properties of metal-containing molecules by spectroscopic methods. These studies provide crucial, fundamental information necessary for the understanding of many photochemical processes in which sunlight is used as an energy source.