True Quantum-State to Quantum State Chemistry: The Detailed Differential Cross-Section for the Unimolecular Decomposition of Group IV Hydrides

在化学学部实验物理化学项目的这个项目中，来自加州大学洛杉矶分校化学系的Delroy Baugh教授将对氨和磷化氢的状态间化学反应动力学进行实验。静电六极场将用于制备这些物种的分子束，这些分子束处于单一的旋转振动状态，完全在量子力学允许的范围内指定。选择的状态分子被激发到一个不稳定的势能表面，导致衰变成碎片，随后分析得到反应的详细微分截面。这项研究的目的是确定控制基本化学反应的势能面。分子最初是在明确定义的量子态中制备的，这使得可以详细跟踪反应过程。将要进行的实验是第一次将氢以外的分子作为研究完全状态到状态反应动力学的对象。这项工作的结果将在分子水平上验证现有的化学反应理论方面发挥重要作用。

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Prof. Delroy Baugh of the Chemistry Department of the University of California at Los Angeles will conduct experiments on the state-to-state chemical reaction dynamics of ammonia and phosphine. An electrostatic-hexapole field will be used to prepare molecular beams of these species in single, rotation-vibrational states that are completely specified within the limits allowed by quantum mechanics. The state selected molecules are excited to an unstable potential energy surface causing decay into fragments which are subsequently analyzed to yield detailed differential cross sections for the reaction. This resesrach is directed toward the determination of the potential energy surface which controls an elementary chemical reaction. Molecules are initially prepared in well defined quantum states which allow detailed tracking of the reaction process. The experiments to be performed are the first in which molecules other than hydrogen will be subject of investigation of complete state-to-state reaction dynamics. The results of this work will play a significant role in validating existing theories of chemical reactions on the molecular level.