Studies of Secondary Processes within High Pressure Electron Capture Ion Sources

这个项目是在一般地区的分析和表面 化学以及质谱和气体的子领域 层析 在现有的痕量分析方法中 对环境或生物医学有重要意义的有机化合物， 那些基于高压、气相、电子捕获 反应与毛细管柱气相色谱联用 已被证明具有上级潜力。 两种这样的方法 结合高压电子捕获质谱仪 （HPECMS）和电子捕获检测器（ECD）。 期间 在这个项目的过程中，格里姆斯鲁德教授和他的学生将 进一步开发利用高效液相色谱质谱仪和电子捕获检测器的技术 并将详细阐述其基本原则， 依赖。 尽管它在痕量化学分析中具有巨大的潜力， 电子捕获光谱（Electron Capture Spectra） HPECMS通常不能用电子俘获来解释 过程，单独，因为了解不多的次要 流程. 该项目的一个目标是提高分析能力， HPECMS的实用性，通过揭示这种 二次过程，并通过确定的手段， 可以消除对分析的不利影响， 效益增强。 为此，一个专门的脉冲 将建造电子束质谱仪， 允许更大的控制和实验参数的变化 比传统的商业工具更容易。 此外，这项研究将通过以下方式扩展ECD的能力： 利用光子诱导电子探测负离子 在这个装置中。

This project is in the general area of analytical and surface chemistry and in the subfields of mass spectrometery and gas chromatography. Of the methods available for the trace analysis of environmentally or biomedically important organic compounds, those based on high pressure, gas phase, electron capture reactions in combination with capillary column gas chromatography have been shown to possess superior potential. Two such methods incorporate the High Pressure Electron Capture Mass Spectrometer (HPECMS) and the Electron Capture Detector (ECD). During the course of this project, Professor Grimsrud and his students will further develop techniques which utilize the HPECMS and the ECD and will elaborate the underlying principles on which they depend. In spite of its great potential for trace chemical analysis, the fundamental basis of "Electron Capture Spectra" observed by HPECMS is often not explicable in terms of electron capture processes, alone, because of poorly understood secondary processes. One goal of this project is to improve the analytical utility of HPECMS by revealing the existence and nature of such secondary processes and by determining the means by which their detrimental effects on analysis can be eliminated and their beneficial effects enhanced. To this end, a specialized pulsed electron beam mass spectrometer will be constructed which will allow greater control and variation of experimental parameters than is possible with conventional, commercial instruments. Also, this research will extend the capability of the ECD through the use of photon-induced electron detachments of negative ions within this device.