Studies of Electron Capture, Secondary Processes, and Photodetachment in High Pressure Ion Sources

这项研究，在分析和表面化学程序 化学部的，将研究电子捕获， 分子。 电子捕获在以下方面得到应用： 确定和量化某些类别的 分子，最突出的是含卤素的分子， 具有重要的生物和环境意义。 教授 格里姆斯鲁德的研究使用质谱法来观察 电子捕获过程和定量痕量污染物 在样品中。 格里姆斯鲁德作品的独特之处在于他使用了 光剥离调制 这提高了特异性， 分析测量的灵敏度。 人们还可以 区分基态的电子俘获能力 和激发态，这对于理解 光化学改变了卤代化合物的化学性质 在环境中。 对次级过程的研究 （电子俘获事件之前或之后的过程） 还指示大气压力气相的细节 研究化合物的化学性质，并可用于 了解分析测量中意外的灵敏度。

This research, in the Analytical and Surface Chemistry Program of the Chemistry Division, will study electron capture by molecules. Electron capture finds application in identification and quantification of certain classes of molecules, most prominently halogen containing molecules which are of biological and environmental importance. Prof. Grimsrud's research uses mass spectrometry to observe the process of electron capture and to quantify trace contaminants in samples. The unique aspect of Grimsrud's work is his use of photodetachment modulation. This improves specificity and sensitivity in analytical measurements. One can also differentiate electron capture capabilities of ground states and excited states, which is important in understanding how photochemistry modifies the chemistry of halogenated compounds in the environment. The study of secondary processes (processes preceeding or succeeding the electron capture event) also is indicative of details of atmospheric pressure gas-phase chemistry of the studied compounds, and is useful in understanding unexpected sensitivity in analytical measurements.