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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 18
Atmos. Chem. Phys., 16, 11823–11836, 2016
https://doi.org/10.5194/acp-16-11823-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 11823–11836, 2016
https://doi.org/10.5194/acp-16-11823-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 23 Sep 2016

Research article | 23 Sep 2016

Heterogeneous photochemistry of imidazole-2-carboxaldehyde: HO2 radical formation and aerosol growth

Laura González Palacios et al.
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AR by L. Gonzalez on behalf of the Authors (29 Jun 2016)  Author's response    Manuscript
ED: Publish as is (15 Jul 2016) by Dwayne Heard
AR by L. Gonzalez on behalf of the Authors (22 Jul 2016)  Author's response    Manuscript
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Short summary
The sources of radicals at aerosol surfaces are highly uncertain. Here we investigate the HO2 radical production from the UV irradiation of imidazole-2-carboxaldehyde (IC) in bulk aqueous films containing IC and citric acid, as well as IC in ammonium sulfate aerosols. We find that IC is an efficient photosensitizer that forms HO2 radicals from H-donor chemistry. IC is a proxy species for brown carbon in atmospheric aerosols.
The sources of radicals at aerosol surfaces are highly uncertain. Here we investigate the HO2...
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