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• W2079519611 abstract "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, α HO2 , to be 0.8 ± 0.3 for H 2 SO 4 and 0.5 ± 0.1 for (NH 4 ) 2 SO 4 particles. In the absence of Cu(II), net reactive loss of HO 2 on H 2 SO 4 aerosol was slow, and we measured a reaction probability, γ HO2 , less than 0.01. In contrast, loss of HO 2 to (NH 4 ) 2 SO 4 aerosol, buffered to pH = 5.1 but without Cu(II), was efficient in our experiment. For this system, aerosol‐induced loss of gas‐phase HO 2 was observed to follow second‐order kinetics, and we infer from our measurements a second‐order aqueous phase reaction rate coefficient of 1 ± 0.25 × 10 7 M −1 s −1 in good agreement with an estimate of 2 ± 1 × 10 7 M −1 s −1 based on literature values of HO 2 aqueous‐phase chemical parameters. These results imply that heterogeneous loss of HO 2 to submicron aqueous sulfate aerosol will be strongly temperature dependent with negligible contribution to odd hydrogen radical (HO x ) removal rates at temperatures warmer than ∼270 K, but potentially large contributions to HO x loss (e.g., >50% of total HO x loss) in colder regions of the troposphere depending on the available aqueous aerosol volume." @default.
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• W2079519611 date "2005-04-27" @default.
• W2079519611 modified "2023-10-13" @default.
• W2079519611 title "Measurements of HO₂uptake to aqueous aerosol: Mass accommodation coefficients and net reactive loss" @default.
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• W2079519611 doi "https://doi.org/10.1029/2004jd005402" @default.
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