Chemical Physics of Model Two-Dimensional Systems

在这个实验物理化学项目中，印第安纳大学布卢明顿分校的乔治·尤因将研究吸附在离子绝缘体表面的双原子和多原子分子的光谱、动力学和反应性。红外光谱技术将用于探索分子结构和运动，衬底与衬底之间的能量传递机制，衬底内部和衬底之间的键合。使用脉冲紫外激光激发，表面的光化学反应将被启动和荧光监测。要研究的系统包括氢、二氧化硫和甲烷对氟化锂、氯化钠和溴化钾的影响。本研究的主要目的是影响当前单层光化学和能量传递的理论模型，并观察和理解表面环境中独特的化学反应。表面可以以多种方式影响化学反应，包括在表面之间的能量传递，改变化学键的强度，以及改变化学反应的能量学。尤因教授的工作将澄清一些涉及相对惰性底物（如氯化钠和溴化钾）上的能量学和化学反应的问题。对这些系统的研究也将有助于我们对更复杂系统的理论理解。

In this project in the Experimental Physical Chemistry Program, George Ewing of Indiana University, Bloomington, will study the spectroscopy, dynamics, and reactivities of diatomic and polyatomic molecules adsorbed on ionic insulator surfaces. Infrared spectroscopic techniques will be used to explore molecular structures and motions, energy transfer mechanisms between the adlayer and the substrate, and bonding within the adlayer and between the adlayer and substrate. Using pulsed ultraviolet laser excitation, photochemical reactions on the surface will be initiated and monitored by fluorescence. Systems to be investigated include hydrogen, sulfur dioxide, and methane on lithium fluoride, sodium chloride, and potassium bromide. A major objective of this research is to influence current theoretical models of monolayer photochemistry and energy transfer, and to observe and understand chemical reactions which are unique to surface environments. Surfaces can influence chemical reactions in a variety of ways, including energy transfer to or from the surface, changing the strength of chemical bonds, and altering the energetics of chemical reactions. Professor Ewing's work will clarify some of the issues involving energetics and chemical reactions on relatively inert substrates such as sodium chloride and potassium bromide. The study of these systems will also contribute to our theoretical understanding of more complex systems.