Mass-Selected Spectroscopy of Cluster Ions and Complexes

Micheal a . Duncan博士得到了实验物理化学项目的资助，研究使用分子束的气相激光汽化。这些实验研究了不寻常的原子排列，这些原子排列可以产生以前未知的化学键，而化学键反过来又可以很好地产生高效的分子能量储存。采用脉冲喷嘴激光汽化技术，在超音速分子束中制备了较轻的主族元素（C、Si、Al等）的电离团簇。类似的方法也用于合成含金属离子分子配合物。这些喷射冷却的物质是在一个特别设计的反射飞行时间质谱仪系统中选择的。波长相关的可见和/或紫外激光光解光谱提供了这些系统中的电子，振动和旋转水平的探针。这些新颖的实验研究了团簇电子和几何结构、光化学解离通道和激发态动力学，为基本键合原理提供了重要的新测试。

Dr. Micheal A. Duncan is supported by a grant from the Experimental Physical Chemistry Program to study gas phase laser vaporization using beams of molecules. These experiments investigate unusual atomic arrangements which can give rise to previously unknown chemical bonds which, in turn, may well allow the production of highly efficient molecular energy stores. Ionized clusters of the lighter main group elements (C, Si, Al, etc.) are prepared in supersonic molecular beams using the technique of pulsed nozzle laser vaporization. Similar methods are used to synthesize metal containing ion-molecule complexes. These jet cooled species are size-selected in a specially designed reflectron time-of-flight mass spectrometer system. Wavelength dependent visible and/or ultraviolet laser photodissociation spectroscopy provides a probe of electronic, vibrational and rotational levels in these systems. These novel experiments investigate cluster electronic and geometric structure, photochemical dissociation channels, and excited state dynamics, providing significant new tests of fundamental bonding principles.