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- W3190745654 abstract "Chlorine-initiated oxidation of alkanes has been shown to rapidly form secondary organic aerosol (SOA) at higher yields than OH–alkane reactions. However, the effects of alkane volatile organic compound precursor structure and the reasons for the differences in SOA yield from OH–alkane reactions remain unclear. In this work, we investigated the effects of alkane molecular structure on oxidation by chlorine radical (Cl) and resulting formation of SOA through a series of laboratory chamber experiments, utilizing data from an iodide chemical ionization mass spectrometer and an aerosol chemical speciation monitor. Experiments were conducted with linear, branched, and branched cyclic C10 alkane precursors under different NOx and RH conditions. Observed product fragmentation patterns during the oxidation of branched alkanes demonstrate the abstraction of primary hydrogens by Cl, confirming a key difference between OH- and Cl-initiated oxidation of alkanes and providing a possible explanation for higher SOA production from Cl-initiated oxidation. Low-NOx conditions led to higher SOA production. SOA formed from butylcyclohexane under low NOx conditions contained higher fractions of organic acids and lower volatility molecules that were less prone to oligomerization relative to decane SOA. Branched alkanes produced less SOA, and branched cycloalkanes produced more SOA than linear n-alkanes, consistent with past work on OH-initiated reactions. Overall, our work provides insights into the differences between Cl- and OH-initiated oxidation of alkanes of different structures and the potential significance of Cl as an atmospheric oxidant." @default.
- W3190745654 created "2021-08-16" @default.
- W3190745654 creator A5013076810 @default.
- W3190745654 creator A5042036387 @default.
- W3190745654 creator A5044961672 @default.
- W3190745654 creator A5080825458 @default.
- W3190745654 date "2021-08-12" @default.
- W3190745654 modified "2023-10-14" @default.
- W3190745654 title "Gas-Phase Chlorine Radical Oxidation of Alkanes: Effects of Structural Branching, NO<sub><i>x</i></sub>, and Relative Humidity Observed during Environmental Chamber Experiments" @default.
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- W3190745654 doi "https://doi.org/10.1021/acs.jpca.1c03516" @default.
- W3190745654 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34383508" @default.
- W3190745654 hasPublicationYear "2021" @default.
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