Mode-Selective Differential Scattering Studies of Ion-Molecule Reaction Dynamics

犹他大学的Scott L. Anderson博士的离子-分子反应动力学的模式选择差分散射研究获得了化学学部物理化学项目的资助。这种散射技术将与理论相结合，用于阐明多原子阳离子反应的详细机理。甲醛阳离子的反应将用于探测碰撞能量和振动对产生的化学反应的影响，反应动力学的直接动力学模拟将与William Hase博士合作完成。与Cheuk Ng博士及Rainer Dressler博士合作，同步辐射研究水与其他小阳离子的反应，而这些小阳离子不适合实验室状态选择。利用REMPI光电子能谱探测里德堡态性质，开发新的阳离子态选择途径，并对这些离子的反应进行研究。多原子分子之间的反应动力学通常取决于动能和内能如何在内部自由度之间分配。将使用激光激发和离子散射方法将选定的反应物调整到不同的激发状态，由此产生的碰撞和反应动力学将进行实验测量和理论计算和模拟。这些研究将为我们理解在燃烧和星际化学中重要的气相反应提供至关重要的进展。

Dr. Scott L. Anderson of the University of Utah is funded for his research on mode-selective differential scattering studies of ion-molecule reaction dynamics by the Physical Chemistry Program of the Chemistry Division. This scattering technique will be used, in conjunction with theory, to elucidate the detailed mechnisms for reaction of polyatomic cations. Reactions of formaldehyde cation will be used to probe the effects of collisional energy and vibrations on resulting chemistry, and direct-dynamics simulations of the reaction dynamics will be done in collaboration with Dr. William Hase. Synchrotron radiation studies of reactions of water with other small cations, not amenable to laboratory state-selection, will be made in collaboration with Dr. Cheuk Ng and Dr. Rainer Dressler. REMPI photoelectron spectroscopy probing Rydberg state properties and developing new cation state-selection routes will be done, and the reactions of these ions will be studied. Reaction dynamics among polyatomic molecules generally depend on kinetic energy and upon how internal energy is partitioned among internal degrees of freedom. Laser excitation and ion scattering methods will be used to tune selected reactants to various states of excitation and the resulting collision and reaction dynamics will be experimentally measured and theoretically calculated and simulated. These studies will provide critically important advances in our understanding of important gas-phase reactions important in combustion and interstellar chemistries.