Vibrational Predissociation and Inelastic Collision Dynamics in Rare Gas/Halogen Systems

在化学系实验物理化学项目的本科生研究(RUI)项目中，斯沃斯莫尔学院的托马斯·A·斯蒂芬森将研究范德华星团NeBr2和I2离子对状态的光诱导动力学。具体地说，将通过探测激光诱导的荧光来检查在超音速自由喷流膨胀中产生的NeBr2的振动预解离动力学，以检验模型预测并探索不同电子态的影响。在I2研究中，将在单碰撞态对态碰撞动力学实验中研究电子激发对转动和振动能量转移几率和路径的影响。%要建立一个全面的了解化学反应的框架，一个关键的组成部分就是阐明两个原子或分子在碰撞过程中相互作用时所涉及的力。这里对原子-硅藻系统进行的研究非常简单，可以从理论上理解和建模，从而为理解更复杂的系统奠定了基础。这些知识对于理解各种气相动力学过程是至关重要的，例如大气反应、燃烧，甚至是通过化学气相沉积合成材料。

In this Research in Undergraduate Institutions (RUI) project in the Experimental Physical Chemistry Program of the Chemistry Division, Thomas A. Stephenson of Swarthmore College will study the photo-induced dynamics of the van der Waals cluster NeBr2 and of the ion-pair states of I2. Specifically, the vibrational predissociation dynamics of NeBr2 produced in a supersonic free jet expansion will be examined via fluorescence induced by a probe laser to test model predictions and to explore the effect of different electronic states. In the I2 studies the effect of electronic excitation on rotational and vibrational energy transfer probabilities and pathways will be studied in single-collision state-to-state collision dynamics experiments. %%% A crucial component in developing a comprehensive framework for understanding chemical reactions is to elucidate the forces involved as two atoms or molecules interact during collisions. The studies undertaken here on atom-diatom systems are simple enough that they can be understood and modeled theoretically, thus providing the groundwork for understanding more complex systems. Such knowledge is crucial for understanding all sorts of gas-phase dynamical processes, such as atmospheric reactions, combustion, and even the synthesis of materials by chemical vapor deposition.