Core Level Excitation and Relaxation in Molecules

实验物理化学项目支持Hanson教授对简单气体分子中原子内壳空位的软x射线激发后的各种衰变通道进行实验研究。在这些高激发分子中发生的竞争性能量耗散过程的基本信息，特别是电子衰变通道与由此产生的化学转化之间的相关性。研究结果可为x射线光刻设备设计中的重要考虑提供指导。来自布鲁克海文国家同步加速器光源的可调谐和单色软x射线辐射用于激发碳，氮，氧或氟的K边附近区域的气相分子或硅，硫，磷或氯的L边。在这种非常有选择性的内部激发之后，使用电子能谱、质谱和荧光技术单独或巧合地提取有关各种衰变过程的信息。

The Experimental Physical Chemistry Program supports Professor Hanson in an experimental investigation of the various decay channels following soft x-ray excitation of atomic inner shell vacancies in simple gaseous molecules. Basic information is being obtained on the competing energy dissipation processes occuring in these highly excited molecules, especially correlations between electronic decay channels and the resulting chemical transformations. The results may provide guidance to important considerations in the design of x-ray lithography equipment. Tunable and monochromatic soft x-ray radiation from the National Synchrotron Light Source at Brookhaven is used to excite gas phase molecules in the region near the K edge of carbon, nitrogen, oxygen, or fluorine or the L edge of silicon, sulfur, phosphorus, or chlorine. Following this very selective internal excitation, information is extracted on the various decay processes using electron spectroscopy, mass spectrometry, and fluorescence techniques, both singly and in coincidence.