Articles | Volume 19, issue 16
https://doi.org/10.5194/acp-19-10817-2019
https://doi.org/10.5194/acp-19-10817-2019
Research article
 | 
27 Aug 2019
Research article |  | 27 Aug 2019

Halogen activation and radical cycling initiated by imidazole-2-carboxaldehyde photochemistry

Pablo Corral Arroyo, Raffael Aellig, Peter A. Alpert, Rainer Volkamer, and Markus Ammann

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Cited articles

Abrahamsson, K., Granfors, A., Ahnoff, M., Cuevas, C. A., and Saiz-Lopez, A.: Organic bromine compounds produced in sea ice in Antarctic winter, Nature Comm., 9, 5291, https://doi.org/10.1038/s41467-018-07062-8, 2018. 
Aregahegn, K. Z., Nozière, B., and George, C.: Organic aerosol formation photo-enhanced by the formation of secondary photosensitizers in aerosols, Faraday Discuss., 165, 123–134, https://doi.org/10.1039/c3fd00044c, 2013. 
Baker, A. R.: Inorganic iodine speciation in tropical Atlantic aerosol, Geophys. Res. Lett., 31, L23S02, https://doi.org/10.1029/2004gl020144, 2004. 
Baker, A. R.: Marine aerosol iodine chemistry: The importance of soluble organic iodine, Environ. Chem., 2, 295–298, https://doi.org/10.1071/en05070, 2005. 
Behnke, W., George, C., Scheer, V., and Zetzsch, C.: Production and decay of ClNO2 from the reaction of gaseous N2O5 with NaCl solution: Bulk and aerosol experiments, J. Geophys. Res., 102, 3795–3804, https://doi.org/10.1029/96jd03057, 1997. 
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Short summary
Oxidation of bromide and iodide is an important process in the troposphere that leads to gas-phase halogen compounds which impact the oxidation capacity of the atmosphere. Imidazole-2-carboxaldehyde (IC), an aromatic carbonyl, is a product of the multiphase chemistry of glyoxal (an oxidation product of isoprene), a major biogenic volatile organic compound. In this study we demonstrate that IC photochemistry leads to efficient oxidation of bromide and iodide and liberation of halogen compounds.
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