Applications of Proton Transfer Mass Spectrometry to Chamber Studies of Gas Phase Oxidation Processes

对复杂反应机理的研究，如人为和生物源排放的挥发性有机化合物(VOCs)的大气氧化，需要能够在快速时间尺度上响应浓度变化的灵敏和选择性的检测技术。配备这种仪器的模拟室能够对了解空气质量和气候所需的大气化学进行详细的动力学和机械知识。在该项目中，高度仪表化大气化学反应堆(HIRAC)的能力将通过耦合质子转移质谱仪(PTrMS)来增强，从而能够测量比目前可能的更多的初级物种和氧化产物，并以更快的时间刻度。这项工作将详细研究生物来源排放的异戊二烯和2-甲基-3-丁烯醇(MBO)等VOCs以及与车辆使用有关的人为来源排放的VOCs在大气化学中的气相氧化过程的动力学和机理。

Studies of complex reaction mechanisms, such as those involved in the atmospheric oxidation of volatile organic compounds (VOCs) emitted by anthropogenic and biogenic sources, require sensitive and selective detection techniques which are able to respond to changes in concentrations on rapid timescales. Simulation chambers equipped with such instrumentation enable detailed kinetic and mechanistic knowledge of the atmospheric chemistry required to understand air quality and climate. In this project, the capabilities of the Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC) will be enhanced by coupling a proton transfer mass spectrometer (PTrMS), enabling measurements of a greater number of primary species and oxidation products, and on a faster timescale, than is currently possible. This work will make detailed investigations of the kinetics and mechanisms of gas phase oxidation processes involved in the atmospheric chemistry of VOCs such as isoprene and 2-methyl-3-butenol (MBO) emitted by biogenic sources, as well as those emitted by anthropogenic sources relating to vehicle use.