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

复杂的反应机制的研究，如那些参与大气氧化的挥发性有机化合物（挥发性有机化合物）排放的人为和生物源，需要敏感和选择性的检测技术，能够响应浓度的变化在快速的时间尺度。配备有这种仪器的模拟室能够提供了解空气质量和气候所需的大气化学的详细动力学和机理知识。在该项目中，将通过与质子转移质谱仪（PTrMS）相耦合来增强大气化学高仪器化反应堆（HIRAC）的能力，从而能够在比目前更快的时间尺度上测量更多的主要物质和氧化产物。这项工作将作出详细的动力学和机制的气相氧化过程中涉及的挥发性有机化合物，如异戊二烯和2-甲基-3-丁烯醇（MBO）的大气化学排放的生物源，以及人为源排放的车辆使用。

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.