Molecular Collision Dynamics: State-Resolved Studies by "Half-Collision" Techniques

分子碰撞动力学：通过“半碰撞”技术进行状态解析研究

• 批准号: 9224039
• 负责人: Paul Kleiber
• 金额: $ 28.53万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9224039&HistoricalAwards=false
• 关键词: Molecular; Collision; Dynamics; State; Resolved

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Professors P. Kleiber, K. Sando, and W. Stwalley of the University of Iowa will continue their investigations of the chemical dynamics of the reaction of hydrogen molecules with excited metal atoms, especially energy transfer collisons by means of state-selective half-collision techniques. Also continued are studies of the near threshold photodissociation dynamics of alkali diatomic molecules. %%% The proposed experiments on reactions between excited metal atoms and molecules will serve to test theoretical models for such processes. Significant deviations from the theoretically predicted behavior will require a revision of a model or at least place limits on its range of validity. Theoretical models also exist for the photodissociation of alkali diatomic molecules. In these models a dissociation is often viewed as a "half-collision" analog of a full collision process, the latter consisting of two incoming and two emerging particles. Such theories are, however, often not amenable to simple physical interpretation and can not easily be applied to complex dissociation processes. In some cases of current interest, such as collisions between ultra-cold atoms, the underlying physics is not understood well enough to allow application of any of the theoretical methods with confidence. The experiments done in this research will provide information that will assist in the clarification of many questions in the domain of collision and photodissociation dynamics.

在化学系实验物理化学项目的这个项目中，爱荷华大学的P. Kleiber、K. Sando和W. Stwalley教授将继续研究氢分子与激发态金属原子反应的化学动力学，特别是通过状态选择性半碰撞技术进行能量转移碰撞。 碱金属双原子分子的近阈值光解离动力学的研究也在继续。 %%% 所提出的关于激发金属原子和分子之间反应的实验将用于测试此类过程的理论模型。 与理论预测行为的显着偏差将需要修改模型或至少限制其有效性范围。 碱性双原子分子的光解离也存在理论模型。 在这些模型中，解离通常被视为完全碰撞过程的“半碰撞”模拟，后者由两个传入粒子和两个新兴粒子组成。 然而，此类理论通常不适用于简单的物理解释，并且不能轻易应用于复杂的解离过程。 在当前感兴趣的某些情况下，例如超冷原子之间的碰撞，人们对基础物理的了解还不够充分，无法放心地应用任何理论方法。 这项研究中进行的实验将提供有助于澄清碰撞和光解动力学领域的许多问题的信息。