Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 12
Articles | Volume 19, issue 12
https://doi.org/10.5194/amt-19-3961-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-3961-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 12
Research article
 | 
17 Jun 2026
Research article |  | 17 Jun 2026

Measuring molecular singlet oxygen (1O2*) from atmospheric photosensitizers: Intercomparison of techniques, irradiation setups, data analysis and protocol recommendations

Keighan J. Gemmell, Laura Marie Dahler Heinlein, Emma A. Petersen-Sonn, Claudia Sardena, Zhongyu Guo, Nory Mariño-Ocampo, Belinda Heyne, Christian George, Cort Anastasio, and Nadine Borduas-Dedekind

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Short summary
Molecular singlet oxygen (1O2*) is the first excited state of O2 and is produced when sunlight excites light-absorbing molecules in aerosols in the atmosphere. 1O2* can drive oxidation reactions and impact aerosol properties. This study is an inter-comparison of photoreactors, light sources and data analysis across 3 atmospheric chemistry laboratories, yielding a critical assessment of practices and recommendations for intercomparing 1O2* measurements and extrapolating to ambient particles.
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