Laser Pump-probe Studies of Reaction Dynamics from One Picosecond to Nanoseconds

实验物理化学项目支持伊利诺伊大学香槟分校的j.d. McDonald教授对反应动力学的研究。具体来说，麦克唐纳教授将使用泵-探针技术在皮秒时间尺度上研究双分子化学反应的动力学。反应物是在冷却的分子束中形成的范德华加合物，中间体和/或产物将使用飞行时间质谱法或激光诱导荧光法检测。此外，反应过程将通过经典轨迹计算或统计理论来模拟。要研究的典型反应包括氯或氧原子向不饱和烃分子加成形成的加合物的重排或分解。这项工作的结果对于理解和模拟在燃烧过程和大气化学中很重要的反应具有重要的价值。氧原子反应在这两种复杂的体系中都很重要，而氯原子在上层大气中也很重要。

The Experimental Physical Chemistry Program supports Prof. J. D. McDonald of the University of Illinois in Champaign-Urbana in his investigations on reaction dynamics. Specifically, Prof. McDonald will use a pump-probe technique to study the dynamics of bimolecular chemical reactions on a picosecond timescale. Reactants are van der Waals adducts formed in a cooled molecular beam, and intermediates and/or products will be detected using either time-of-flight mass spectrometry or laser-induced fluorescence. In addition, reaction processes will be modeled by classical trajectory calculations or statistical theories. Typical reactions to be investigated include rearrangements or decomposition of adducts formed by addition of chlorine or oxygen atoms to unsaturated hydrocarbon molecules. The results of this work are of great value to the understanding and modeling of reactions which are important in combustion processes and in the chemistry of the atmosphere. Oxygen atom reactions are very important in both these complex systems, and chlorine atoms are important in the upper atmosphere.