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

该奖项由2009年美国复苏和再投资法案(公共法律111-5)资助。在这个由实验物理化学计划支持的项目中，鲍林格林州立大学的Alexander N.Tarnovsky教授将使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离动力学。目标体系包括不同有机溶剂中的卤代甲烷分子(CF2I2、CH2I2和CH2BrI)。将使用涵盖从单个振动周期到纳秒的时间域的广泛电磁光谱(X射线到红外)的各种探测器来监测光诱导的键断裂和结构重排。周围液体介质的性质(极性、极化率、局部结构)有望对解离和复合过程产生显著的时间相关影响。除了促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的影响的一般理解，并可能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-S教授的科研项目将为研究生和本科生提供丰富的科研培训经验。来自当地公立学校的两名高中理科教师也将参与这项研究，并将他们工作的一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.