Articles | Volume 16, issue 18
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, Pablo Corral Arroyo, Kifle Z. Aregahegn, Sarah S. Steimer, Thorsten Bartels-Rausch, Barbara Nozière, Christian George, Markus Ammann, and Rainer Volkamer


Total article views: 3,865 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
2,236 1,512 117 3,865 341 74 121
  • HTML: 2,236
  • PDF: 1,512
  • XML: 117
  • Total: 3,865
  • Supplement: 341
  • BibTeX: 74
  • EndNote: 121
Views and downloads (calculated since 11 Feb 2016)
Cumulative views and downloads (calculated since 11 Feb 2016)


Saved (preprint)

Discussed (final revised paper)

Discussed (preprint)

Latest update: 01 Mar 2024
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.
Final-revised paper