Aerosol Physics Laboratory, Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland.
Environ Sci Technol. 2010 Dec 1;44(23):8917-23. doi: 10.1021/es101572u. Epub 2010 Nov 9.
An ion mobility spectrometer (IMS) was used to study gas phase compounds during nucleation and growth of secondary organic aerosols (SOA). In this study SOA particles were generated by oxidizing α-pinene with O(3) and OH in a 6 m(3) reaction chamber. Positive ion peaks with reduced mobilities of 1.59 cm(2)(Vs)(-1) and 1.05 cm(2)(Vs)(-1) were observed 7 min after α-pinene and ozone were added to the chamber. The detected compounds can be associated with low volatility oxidation products of α-pinene, which have been suggested to participate in new particle formation. This is the first time that IMS has been applied to laboratory studies of SOA formation. IMS was found suitable for continuous online monitoring of the SOA formation process, allowing for highly sensitive detection of gas phase species that are thought to initiate new particle formation.
离子迁移谱仪（IMS）被用于研究二次有机气溶胶（SOA）成核和生长过程中的气相化合物。在这项研究中，通过在 6 立方米的反应室中用 O(3) 和 OH 氧化α-蒎烯来生成 SOA 颗粒。在向腔室中添加α-蒎烯和臭氧 7 分钟后，观察到具有降低迁移率的 1.59 cm(2)(Vs)(-1)和 1.05 cm(2)(Vs)(-1)的正离子峰。所检测到的化合物可以与 α-蒎烯的低挥发性氧化产物相关联，这些产物被认为参与了新粒子的形成。这是 IMS 首次应用于 SOA 形成的实验室研究。IMS 被发现适合于 SOA 形成过程的连续在线监测，能够高度灵敏地检测被认为引发新粒子形成的气相物质。
