Inner-Shell Excitation and Deexcitation in Small Molecules

在化学系物理化学项目中，俄勒冈州立大学的T·达拉·托马斯教授将利用电子能谱研究分子的内壳层激发和去激发。主要的兴趣是开发在气相中执行俄歇-光电子符合谱的设备，并使用零动能谱来确定核心电离分子的寿命。此外，内壳层电离能与其他化学性质之间的关系将继续进行研究。在俄歇光电子能谱中，光谱的测量是与选定能量的光电子相符合的。这项技术使得研究单一的、选择的激发态的退激路径成为可能，从而对理解复杂的俄歇谱是一个重要的帮助。到目前为止，这项技术仅适用于固体。该项目的目的是将其适用范围扩展到气相系统。核心电离能可以直接与影响许多化学性质的因素有关。对俄歇光电子能谱和核电离能这两个领域的研究将有助于更好地理解化学现象。

In this project in the Physical Chemistry program of the Chemistry Division, Prof T. Darrah Thomas of the Oregon State University will engage in a study of the inner-shell excitation and deexcitation of molecules by electron spectroscopy. Of primary interest is the development of facilities to perform Auger-photoelectron coincidence spectroscopy in the gas phase and on using zero-kinetic energy spectroscopy to determine the lifetimes of core-ionized molecules. In addition, the relationship between the inner-shell ionization energies and other chemical properties will continue to be investigated. In Auger-photoelectron spectroscopy the spectrum is measured in coincidence with photoelectrons of selected energy. This technique makes it possible to study the deexcitation pathways of a single, selected excited state and thereby it is an important aid in the understanding of complex Auger spectra. This technique has heretofore been applied only to solids. The aim of this project is to extend its applicability to systems in the gaseous phase. Core-ionization energies can be related directly to the factors that influence a number of chemical properties. Research in the two areas of Auger photoelectron spectroscopy and core-ionization energies will contribute to a better understanding of chemical phenomena.