Development and Demonstration of Rapid Analysis of Single- Particle Composition Using Mass Spectrometry

小行星9703615 该项目支持构建可现场部署的快速单粒子质谱仪（RSMS）。该仪器将能够提供40至200纳米尺寸范围内的单个颗粒的化学和尺寸信息。这将通过用专门设计的喷嘴入口选择颗粒的大小，使用准分子激光辐射蒸发颗粒并使用质谱分析碎片来实现。化学成分如有机碳、元素碳、硫酸盐、甲烷磺酸盐和氯化钠将是可区分的。由于用相同组成的颗粒获得的信号强度的拍摄到拍摄的变化，以及由于技术对表面物质的偏差，信息将是半定量的。 然而，化学计量学数据分析技术能够对获得的光谱进行分类，并提取关于气溶胶组成和混合状态（外部与内部）的信息。 一旦现场部署仪器的组装完成，将在当地进行测试，以证明在环境空气条件下的技术。将校准和确认尺寸测量技术。

9703615 Wexler This project supports the construction of a field-deployable Rapid Single-Particle Mass Spectrometer (RSMS). This instrument will be capable of providing chemical as well as size information on individual particles in the size range of 40 to 200 nm. This will be achieved by size selecting particles with a specially designed nozzle inlet, evaporating the particles using excimer laser radiation and analyzing the fragments using mass spectrometry. Chemical constituents such as organic carbon, elemental carbon, sulfates, methane sulfonates, and sodium chloride will be distinguishable. The information will be semi-quantitative due to shot-to-shot variations in signal intensity obtained with particles of identical composition, and due to a bias of the technique to surface species. However, chemometric data analysis techniques are capable of classifying the obtained spectra and extracting information on the aerosol composition and mixing state (external vs. internal). Once the assembly of the field-deployable instrument is completed, it will be tested at a local site to demonstrate the technique at ambient air conditions. The sizing technique will be calibrated and validated.