N2O5 oxidizes chloride to Cl2 in acidic atmospheric aerosol |
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Authors: | Roberts James M Osthoff Hans D Brown Steven S Ravishankara A R |
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Institution: | Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, CO 80305, USA. James.M.Roberts@noaa.gov |
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Abstract: | Molecular chlorine (Cl2) is an important yet poorly understood trace constituent of the lower atmosphere. Although a number of mechanisms have been proposed for the conversion of particle-bound chloride (Cl-) to gas-phase Cl2, the detailed processes involved remain uncertain. Here, we show that reaction of dinitrogen pentoxide (N2O5) with aerosol-phase chloride yields Cl2 at low pH (<2) and should constitute an important halogen activation pathway in the atmosphere. |
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