We present room temperature measurements of HO 2 uptake to aqueous submicron aerosol obtained with an entrained aerosol flow tube coupled to a chemical ionization mass spectrometer. Two aqueous aerosol types were examined, H 2 SO 4 at 35-40% relative humidity (RH) and (NH 4 ) 2 SO 4 at 40-45% RH. By doping the aerosol with Cu(II) ($0.1 M in aerosol) to create an efficient aerosol sink, we determine lower limits to the mass accommodation coefficient, a HO2 , to be 0.8 ± 0.3 for H 2 SO 4 and 0.5 ± 0.1 for (…
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