Development of a New Ion-Molecule Reaction Dynamics Imaging Apparatus for Chemistry Research

在主要研究仪器（MRI）和化学研究仪器和设施（CRIF）项目的支持下，内华达大学里诺分校的Kent M. Ervin教授将开发一种用于化学研究的离子分子反应动力学成像设备。这种新的分析工具将有助于离子-分子反应动力学和能量学的研究。特别是，它将允许测量离子-分子反应的总反应截面和产物速度和角分布，具有高灵敏度和高能量和角分辨率。该设计要求交叉离子和分子脉冲光束有三个主要组成部分：四极离子阱源；反射式飞行时间质谱仪；还有一个速度离子成像探测器。应用包括反应动力学以及离子和中性热化学的基础研究。由于产品动能的高分辨率测量，与传统仪器相比，能量测量的准确度和精度将有可能更高。该仪器设计在未来的分析化学应用中具有潜在的吸引力，例如，气相色谱/质谱中的动态能量选择碰撞诱导解离分析或液相色谱/质谱中的电喷雾离子分析。

With support from the Major Research Instrumentation (MRI) and the Chemistry Research Instrumentation and Facilities (CRIF) Programs, Prof. Kent M. Ervin of the University of Nevada in Reno will develop an ion-molecule reaction dynamics imaging apparatus for chemistry research. This new analytical tool will falicitate investigations of the dynamics and energetics of ion-molecule reactions. In particular, it will allow the measurement of total reaction cross sections and product velocity and angular distributions for ion-molecule reactions with both high sensitivity and high energy and angular resolution. The design calls for crossed ion and molecular pulsed beams with three major components: a quadrupole ion trap source; a reflectron time-of-flight mass spectrometer; and a velocity mapped ion imaging detector. Applications include fundamental investigations of reaction dynamics as well as ion and neutral thermochemistry. Greater accuracy and precision in energetics measurements will be possible compared with traditional instruments because of the high-resolution measurement of the kinetic energies of products. The instrumentation design is potentially attractive for future analytical chemistry applications - for example, for on-the-fly energy-selective collision-induced dissociation analysis in gas chromatography/mass spectrometry or from electrosprayed ions in liquid chromatography/mass spectrometry.