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Formation of hydroxyl radicals from photolysis of secondary organic aerosol material

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Table 1. Peroxide yields from fresh SOA samples (this study) and from literature reports (see text for explanation).
Figure 1. Schematic diagrams of the environmental chamber (a) and the photoreactor (b).
Figure 2. Photon flux (dashed line) inside the glass vessel in the photoreactor and SOA ab- ab-sorption cross section from (Wong et al., 2014) (solid line).
Figure 3. Concentrations of p-hydroxybenzoic acid (PHBA) formed by photolysis experiments for: 250 µM solutions of SOA and 12.5 µM solutions of commercial hydroperoxides

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