Spectroscopic Determinations of Excited State Properties of Organometallic and Inorganic Compounds

四种方法将被用来研究含金属分子在从低温单晶到气相的各种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指认。该程序的第二部分是从电子光谱中的振动结构确定激发态扭曲。实验将集中在超音速自由膨胀射流的冷碰撞无碰撞条件下以及在凝聚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轮廓来确定激发态扭曲。因此，即使在电子光谱很宽和没有特征的情况下，也可以逐个模式地检查激发态。最后，利用激发态抽运-探测拉曼光谱测量了激发态分子的几何构型。所有实验的目的都是为了统一理解金属化合物的激发态轨道特性、表面势位移和几何结构。%在化学部无机、生物无机和有机金属项目中，加州大学洛杉矶分校的杰弗里·I·津克博士将继续研究用光谱方法确定含金属分子的激发态性质。这些研究为理解利用阳光作为能源的许多光化学过程提供了至关重要的基本信息。

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.