Formation of HO2 and OH in photolytically initiated oxidation of dimethyl ether

Time-resolved measurements of HO2 and OH have been conducted in 355 nm photolysis of dimethyl ether/Cl2/O2 mixture at elevated temperature, using near-infrared frequency modulation spectroscopy. It was rationalized that HO2 is not a direct product of the O2 adduct decomposition, but a secondary product through HCHO + OH reaction.