Reactivity and Spectroscopy of Small Metal and Semiconductor Clusters

这项研究是实验物理化学的一部分， 计划，将需要光谱研究的小金属和 半导体分子和金属的反应性研究 集群作为大小和组成的函数。这些研究 将有助于发展一个统一的理论， 金属/半导体电子结构，可以解释 物理和化学性质随尺寸的变化。 团簇将通过靶的激光汽化来制备 材料的喉部的脉冲超音速喷嘴，并将 在真空室中通过光电离被检测到 飞行时间光谱法消耗的计量 裸金属集群和产品的增长，然后提供 金属簇的化学反应率作为 大小和组成。激光诱导双光子电离 荧光，受激发射光谱将是 用来测量键长，振动频率， 各种金属和半导体二聚体的术语符号， 三聚体。

This research, part of the Experimental Physical Chemistry Program, will entail spectroscopic studies of small metal and semiconductor molecules, and reactivity studies of metal clusters as functions of size and composition. These studies will contribute towards the development of a unified theory of metal/semiconductor electronic structure which can account for the variation in physical and chemical properties with size. Clusters will be prepared by laser vaporization of a target material in the throat of a pulsed supersonic nozzle, and will be detected in a vacuum chamber by photoionization time-of-flight spectrometry. Measurements of the depletion of bare metal clusters and growth of products then provide chemical reactivity rates for metal clusters as functions of size and composition. Two-photon ionization, laser induced fluorescence, and stimulated emission spectroscopies will be employed to measure bond lenghts, vibrational frequencies, and term symbols of various metal and semiconductor dimers and trimers.