Density Dependence of Electronic States in Non-Polar Fluids

在实验物理化学计划的这个项目中，威斯康星大学同步辐射中心的鲁本·莱宁格将探索稠密介质中光致电离的基本方面。主要的实验工具将是真空紫外光同步辐射激发态场电离。我们将确定稠密介质中光电离所固有的两个基本量，即正离子的极化能和准自由电子的能量。要研究的体系包括液态氩和液态氙气中的甲基碘，液态氩中的NO，以及纯乙烷。这些研究有望产生实验数据，用来检验和修正最近描述作为介质密度函数的能级演化的理论模型。最近报道了大量关于液体的电子结构以及这种结构与密度的依赖关系的理论工作，以了解这种结构如何从单个原子到它们形成的固体的变化。莱宁格博士将通过使用场诱导光电离来探测这种结构，这将提供关于流体中离子的极化能量和电离抛出的电子的能量的信息。然后，这些信息将被用来测试当前的理论，并指出这些理论必须如何修改。

In this project in the Experimental Physical Chemistry Program, Ruben Reininger of The University of Wisconsin Synchrotron Radiation Center will probe fundamental aspects of photoionization in dense media. The main experimental tool will be field ionization of states excited by means of vacuum ultraviolet synchrotron radiation. The two basic quantities inherent to photoionization in dense media, the polarization energy of the positive ion and the energy of the quasi-free electron, will be determined. Systems to be studied include methyl iodide in liquid argon and liquid xenon, NO in liquid argon, and pure ethane. These studies are expected to yield experimental data with which recent theoretical models describing the evolution of energy levels as a function of the density of the medium may be tested and revised. A considerable amount of theoretical work has recently been reported on the electronic structure of liquids and the dependence of this structure on density in order to understand how this structure changes from individual atoms to the solids they form. Dr. Reininger will probe this structure by using field induced photoionization, which will provide information concerning the polarization energy of the ion in the fluid and the energy of the electron ejected by ionization. This information will then be used to test current theories and indicate how these theories must be modified.