Laser spectroscopy of jet-cooled main group reactive intermediates

在这项由化学系化学结构、动力学和机理计划资助的项目中，肯塔基大学的Dennis Clouthier教授将使用激光光谱方法研究主要基团反应中间体的电子光谱，集中在含有磷、砷、硼和第三族金属的自由基上。这些物种将由稳定的前体化合物的电子碰撞碎裂产生，在超音速膨胀中冷却到几个开尔文的温度，并通过激光诱导荧光和共振增强多光子电离来检测。这些瞬时分子中的许多都是作为半导体生长中间体出现的。此外，含有磷和铝的自由基一旦在实验室中被识别和表征，就很有可能在星际介质中被发现。从这些瞬变物种获得的光谱信息将为未来工业过程和化学反应中活性物种的研究提供必要的基准数据。该项目将为新一代物理化学家提供技术要求高和具有挑战性的科学领域的培训，在这个领域缺乏合格的从业人员。

In this project funded by the Chemical Structure, Dynamics and Mechanisms Program of the Chemistry Division, Professor Dennis Clouthier of the University of Kentucky will use laser spectroscopic methods to study the electronic spectra of main group reactive intermediates, concentrating on free radicals containing phosphorus, arsenic, boron and group III metals. These species will be generated by electron impact fragmentation of stable precursor compounds, cooled to temperatures of a few Kelvin in a supersonic expansion, and detected by laser-induced fluorescence and resonance enhanced multiphoton ionization. Many of these transient molecules are of interest as they occur as semiconductor growth intermediates. In addition, there is a high probability that the free radicals containing phosphorus and aluminum can be found in the interstellar medium once they have been identified and characterized in the laboratory. The spectroscopic information obtained from these transient species will provide necessary benchmark data for future studies of reactive species in industrial processes and chemical reactions. This project will provide training for a new generation of physical chemists in a technically demanding and challenging area of science in which there is a dearth of well-qualified practitioners.