CAREER: Monitoring ultrafast excited-state selective dynamics, bond rupture, and rearrangement of small polyatomic molecules in solution

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。州立大学鲍灵绿色的Tarnovsky将利用超快飞秒激光泵浦探测光谱和其他几种时间分辨技术，包括X射线和红外吸收，探索溶液中小多原子分子的光解动力学。 目标系统包括在不同有机溶剂中的卤代甲烷分子（CF2 I2、CH 2 I2和CH 2BrI）。 光诱导键断裂和结构重排将使用各种探针进行监测，这些探针涵盖了从单个振动周期到纳秒的广泛的电磁光谱（X射线到红外线）。 周围的液体介质的性质（极性，极化率，局部结构）预计有显着的时间依赖性的影响解离和重组过程。除了推进我们对卤代烃光化学的理解外，这项研究还将有助于我们对溶剂环境对化学反应影响的一般理解，也许还有助于我们利用超快激光技术控制化学反应途径的能力。 塔尔诺夫斯基教授的研究项目将为研究生和本科生提供丰富的研究培训经验。 来自当地公立学校的两名高中科学教师也将参加这项研究，并将他们工作的某些方面纳入他们的课程。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).In this project supported by the Experimental Physical Chemistry Program, Professor Alexander N. Tarnovsky of Bowling Green State University will explore the photo-dissociation dynamics of small polyatomic molecules in solution using ultrafast femtosecond laser pump-probe spectroscopy and several other time-resolved techniques, including x-ray and infrared absorption. The target systems include halogenated methane molecules (CF2I2, CH2I2, and CH2BrI) in different organic solvents. Photoinduced bond breaking and structural rearrangement will be monitored using various probes that encompass a wide range of the electromagnetic spectrum (x-ray to infrared) covering time domains from a single vibrational period to nanoseconds. The properties of the surrounding liquid medium (polarity, polarizability, local structure) are expected to have significant time-dependent influence on dissociation and recombination processes. In addition to advancing our understanding of the photochemistry of halogenated hydrocarbons, this research will also contribute to our general understanding of solvent environmental effects on chemical reactions, and perhaps to our ability to control chemical reaction pathways using ultrafast laser techniques. Professor Tarnovsky?s research program will provide a rich research training experience for both graduate and undergraduate students. Two high school science teachers from local public schools will also take part in the research, and incorporate some aspects of their work into their curricula.