Articles | Volume 16, issue 18
https://doi.org/10.5194/acp-16-11823-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acp-16-11823-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
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
Department of Chemistry and Biochemistry, 215 UCB, University of Colorado, Boulder, CO 80309, USA
Cooperative Institute for Research in Environmental Sciences (CIRES), 216 UCB, University of Colorado, Boulder, CO 80309, USA
Pablo Corral Arroyo
Laboratory of Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
Department of Chemistry and Biochemistry, University of Bern, 2012 Bern, Switzerland
Kifle Z. Aregahegn
Université Lyon 1, CNRS, UMR 5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, 2 avenue Albert Einstein, 69626 Villeurbanne, France
now at: Chemistry Department, University of California, Irvine, California, 92697-202, USA
Sarah S. Steimer
Laboratory of Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
Institute for Atmospheric and Climate Science, Swiss Federal Institute of Technology Zurich, 8092 Zurich, Switzerland
now at: Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
Thorsten Bartels-Rausch
Laboratory of Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
Barbara Nozière
Université Lyon 1, CNRS, UMR 5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, 2 avenue Albert Einstein, 69626 Villeurbanne, France
Christian George
Université Lyon 1, CNRS, UMR 5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, 2 avenue Albert Einstein, 69626 Villeurbanne, France
Markus Ammann
Laboratory of Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
Rainer Volkamer
CORRESPONDING AUTHOR
Department of Chemistry and Biochemistry, 215 UCB, University of Colorado, Boulder, CO 80309, USA
Cooperative Institute for Research in Environmental Sciences (CIRES), 216 UCB, University of Colorado, Boulder, CO 80309, USA
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Latest update: 18 Nov 2025
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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