Spectroscopy and Dynamics of Ions

该项目由化学部实验物理化学项目资助，Lineberger将对负离子光电子能谱、时间分辨光解光谱和时间分辨光电子能谱进行研究。待研究的体系包括双基和三基（例如1,3,5-脱氢苯阴离子）；复合双自由基和簇状自由基；阴离子配合物用于过渡态光谱和时间分辨光谱的研究。负离子-中性-正离子（NeNePo）技术将用于研究配合物沿反应坐标的演变结构。正在进行的能量流动和笼化动力学的研究，在大小选择阴离子簇将继续，扩展到包括不对称发色团，三原子发色团，和混合溶剂，以提供深入的新见解，他们的动力学。簇离子中时间分辨动力学的研究将从双原子发色团扩展到三原子物种。这项工作将包括对预反应性配合物的研究，光激发可以刺激化学反应。这里的重点将放在光激发上，它会导致团簇络合物中显著的电荷重新分布，从而提供了对溶剂重组过程的直接观察。这项研究涉及反应化学的基本问题。目标是获得新的见解结构和化学中间体和溶剂化离子的反应过程。该研究将与内部和外部合作者以及博士后研究助理和研究生一起进行。博士后和学生在物理化学的一个前沿领域获得宝贵的经验，为工业、学术界或政府实验室的高级研究或就业做准备。积极开展外展计划，招募下一代科学家，并将化学的兴奋带给高中生和大学生，作为培养受过科学教育的公民的贡献。

In this project funded by the Experimental Physical Chemistry Program of the Chemistry Division, Lineberger will conduct research in negative ion photoelectron spectroscopy, time resolved photodissociation spectroscopy, and time resolved photoelectron spectroscopy. Systems to be studied include biradical and triradical (e.g., 1,3,5-dehydrobenzene anion) species; complex biradical and clustered radical species; and anion complexes for the investigations of transition state spectroscopies and time resolved spectroscopy. A Negative Ion-Neutral-Positive Ion (NeNePo) technique will be developed to investigate the evolving structure of complexes along a reaction coordinate. Ongoing studies of energy flow and caging dynamics in size-selected anionic clusters will be continued, with extensions to include asymmetric chromophores, triatomic chromophores, and mixed solvents, in order to provide deep new insights into their dynamics. Studies of time resolved dynamics in cluster ions will be extended from diatomic chromophores to triatomic species. This work will include work on prereactive complexes where photoexcitation can stimulate chemical reaction. Here the emphasis will be on photoexcitation that results in significant charge redistribution in the cluster complex, affording a direct look at solvent reorganization processes.This research deals with fundamental problems of reaction chemistry. The goal is to obtain new insights into the structure and reactive processes of chemical intermediates and solvated ions. The research will be conducted with internal and external collaborators as well as with postdoctoral research associates and graduate students. The postdocs and students gain valuable experience in one of the forefront areas of physical chemistry in preparation for advanced studies or employment in industry, academia, or government laboratories. An active outreach program is conducted for the recruitment of the next generation of scientists and to bring the excitement of chemistry to high school and college students as a contribution to the development of a scientifically educated citizenry.