The role of functional groups in the understanding of secondary organic aerosol formation mechanism from α-pinene
•The SOA is characterized by O–H groups in the OH channel and C=O groups in the O3 channel
•The nO−H/nC=O ratio is a good parameter in revealing the difference of SOA between the O3 and OH oxidation channels
•The SOA from OH channel is mainly formed by autoxidation of RO2 radicals
•Different structures of RO2 radicals are responsible for the difference functional group signatures of SOA
Role of liquid water in the formation of O3 and SOA particles from 1,2,3-trimethylbenzene
• Liquid water can affect the formation of O3 and SOA from 1,2,3-trimethylbenzene.
• The hygroscopic growth factors of SOA from 1,2,3-trimethylbenzene were measured.
• Hydrolysis of N2O5 is the major reason for the decrease of O3.
• The major contribution of SOA under high LWC conditions comes from aqueous reaction.
Luo, H., Jia, L., Wan, Q., An, T., Wang, Y., 2019. Role of liquid water in the formation of O3 and SOA particles from 1,2,3-trimethylbenzene. Atmos. Environ. 217, 116955. https://doi.org/10.1016/j.atmosenv.2019.116955
Influence of relative humidity on cyclohexene SOA formation from OH photooxidation
• Combined effects of OH and RH on cyclohexene SOA formation were studied.
• The formation of oligomers at high RH was responsible for the increase of the SOA yield.
• High RH increases the OH uptake coefficient of SOA, and promotes SOA aging.
• Oligomers formation mechanism from cyclohexene photooxidation at high RH was proposed.
Liu, S., Tsona, N.T., Zhang, Q., Jia, L., Xu, Y., Du, L., 2019. Influence of relative humidity on cyclohexene SOA formation from OH photooxidation. Chemosphere 231, 478–486. https://doi.org/10.1016/j.chemosphere.2019.05.131
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