U.S.-UK Cooperative Research: Accurate Semiclassical Methods for Redistribution of Polarized Radiation

该奖项将支持理论方面的合作研究 密苏里州大学的罗纳德比尼克博士 罗拉和两位英国科学家：基思伯内特博士， 牛津大学克拉伦登实验室和马克·蔡尔德博士， 牛津大学理论化学系。 的 拟议的研究旨在开发准确的半经典 描述和分析碰撞的模型和方法 以及偏振辐射的半碰撞再分布。 当偏振光在近原子/分子过程中被吸收时， 当粒子完全碰撞或半碰撞时，碎片会产生荧光 分开后的光 偏振度 保留在光中，作为激光失谐的函数， 包含了很多关于分子间势能的信息， 从分子域到原子域的根本转变。 分析有关性能的实验信息是 如果准确和易于处理的理论， 研究人员可以使用工具来可视化 现象并描述基本的物理学。 半古典- cal技术，以经典的方式处理某些方面 和其他量子力学的方法，可以提供 相当深刻的见解 然而，目前的半经典方法 在许多方面，再分配是不令人满意的。 这 该项目旨在改善这种情况， 流行的锁定/解耦模型，并开发新的 处理相位干涉效应的技术 激励事件，轨道旋转的科里奥利制动，以及 原子和原子之间的边界的变幻莫测 角动量的分子耦合 英国合作- 参与研究的人都是再分配研究的前沿人物 美国研究员比尼克博士将从 有机会进行这次长期的研究访问。

This award will support collaborative research in theoretical physics between Dr. Ronald Bieniek, University of Missouri at Rolla, and two British scientists: Dr. Keith Burnett, Clarendon Laboratory, Oxford University and Dr. Mark Child, Theoretical Chemistry Department, Oxford University. The proposed study is aimed at developing accurate semiclassical models and methods of describing and analyzing collisional and half-collisional redistribution of polarized radiation. When polarized light is absorbed during a close atomic/molec- ular full- or half-collision, the fragments will flouresce light after they separate. The degree of polarization remaining in the light, as a function of laser detuning, contains much information about intermolecular potentials and the fundamental transition from molecular to atomic domains. The analysis of experimental information about properties is greatly facilitated if accurate and tractable theoretical tools are available with which investigators can visualize the phenomena and describe the underlying physics. Semiclassi- cal techniques, which treat some aspects in a classical way and others in a quantum mechanical manner, can offer considerable insight. However, current semiclassical methods for redistribution are, in many ways, unsatisfactory. This project is designed to improve this situation by enhancing the popular locking/decoupling model, and developing new techniques to deal with phase interference effects between excitation events, Coriolis braking of orbital rotation, and the vagaries of the boundary between the atomic and the molecular coupling of angular momenta. The British collabora- tors involved are at the forefront of redistribution research and the US investigator Dr. Bieniek will benefit greatly from the opportunity to carry out this long term research visit.