Articles | Volume 14, issue 3
https://doi.org/10.5194/amt-14-1851-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-14-1851-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
05 Mar 2021
Research article |
| 05 Mar 2021
| 05 Mar 2021
Characterization of a chemical modulation reactor (CMR) for the measurement of atmospheric concentrations of hydroxyl radicals with a laser-induced fluorescence instrument
Changmin Cho
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Andreas Hofzumahaus
CORRESPONDING AUTHOR
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Hendrik Fuchs
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Hans-Peter Dorn
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Marvin Glowania
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Frank Holland
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Franz Rohrer
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Vaishali Vardhan
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Astrid Kiendler-Scharr
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Andreas Wahner
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
Troposphere (IEK-8), Institute of Energy and Climate Research, Forschungszentrum Jülich, 52425 Jülich, Germany
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Cited
14 citations as recorded by crossref.
- Measurement report: Comprehensive seasonal study of the composition and sources of submicron aerosol during the JULIAC campaign in Germany L. Liu et al. https://doi.org/10.5194/acp-25-16189-2025
- Experimental chemical budgets of OH, HO2, and RO2 radicals in rural air in western Germany during the JULIAC campaign 2019 C. Cho et al. https://doi.org/10.5194/acp-23-2003-2023
- Effect of the Alkoxy Radical Chemistry on the Ozone Formation from Anthropogenic Organic Compounds Investigated in Chamber Experiments M. Färber et al. https://doi.org/10.1021/acsestair.4c00064
- Re-assessing hydroxyl radical chemistry in the atmosphere: Instrument interferences may explain previous measurement discrepancies P. Price et al. https://doi.org/10.1038/s43247-025-02308-y
- Techniques for measuring indoor radicals and radical precursors E. Alvarez et al. https://doi.org/10.1080/05704928.2022.2087666
- Comparison of isoprene chemical mechanisms under atmospheric night-time conditions in chamber experiments: evidence of hydroperoxy aldehydes and epoxy products from NO3 oxidation P. Carlsson et al. https://doi.org/10.5194/acp-23-3147-2023
- OH and HO2 radical chemistry at a suburban site during the EXPLORE-YRD campaign in 2018 X. Ma et al. https://doi.org/10.5194/acp-22-7005-2022
- Improved laser-induced fluorescence instrument via chemical modulation for OH radical measurement: High-sensitivity detection and interference evaluation H. Cai et al. https://doi.org/10.1016/j.snb.2025.139418
- Intercomparison of OH radical measurement in a complex atmosphere in Chengdu, China G. Zhang et al. https://doi.org/10.1016/j.scitotenv.2022.155924
- A Study on Monitoring OH Radicals Using Optical Measurement Techniques M. Jeon https://doi.org/10.31818/JKNST.2025.9.8.3.523
- Quantitative study on the interference of OH radicalmeasurement in the air pollution complex X. Ma et al. https://doi.org/10.1360/TB-2022-0581
- COSMOGENIC14CO FOR ASSESSING THE OH-BASED SELF-CLEANING CAPACITY OF THE TROPOSPHERE C. Brenninkmeijer et al. https://doi.org/10.1017/RDC.2021.101
- Comparison of Isoprene Chemical Mechanisms with Chamber and Field Observations W. Brune et al. https://doi.org/10.1021/acsearthspacechem.4c00196
- Impact of temperature-dependent non-PAN peroxynitrate formation, RO2NO2, on nighttime atmospheric chemistry M. Färber et al. https://doi.org/10.1039/D3CP04163H
14 citations as recorded by crossref.
- Measurement report: Comprehensive seasonal study of the composition and sources of submicron aerosol during the JULIAC campaign in Germany L. Liu et al. https://doi.org/10.5194/acp-25-16189-2025
- Experimental chemical budgets of OH, HO2, and RO2 radicals in rural air in western Germany during the JULIAC campaign 2019 C. Cho et al. https://doi.org/10.5194/acp-23-2003-2023
- Effect of the Alkoxy Radical Chemistry on the Ozone Formation from Anthropogenic Organic Compounds Investigated in Chamber Experiments M. Färber et al. https://doi.org/10.1021/acsestair.4c00064
- Re-assessing hydroxyl radical chemistry in the atmosphere: Instrument interferences may explain previous measurement discrepancies P. Price et al. https://doi.org/10.1038/s43247-025-02308-y
- Techniques for measuring indoor radicals and radical precursors E. Alvarez et al. https://doi.org/10.1080/05704928.2022.2087666
- Comparison of isoprene chemical mechanisms under atmospheric night-time conditions in chamber experiments: evidence of hydroperoxy aldehydes and epoxy products from NO3 oxidation P. Carlsson et al. https://doi.org/10.5194/acp-23-3147-2023
- OH and HO2 radical chemistry at a suburban site during the EXPLORE-YRD campaign in 2018 X. Ma et al. https://doi.org/10.5194/acp-22-7005-2022
- Improved laser-induced fluorescence instrument via chemical modulation for OH radical measurement: High-sensitivity detection and interference evaluation H. Cai et al. https://doi.org/10.1016/j.snb.2025.139418
- Intercomparison of OH radical measurement in a complex atmosphere in Chengdu, China G. Zhang et al. https://doi.org/10.1016/j.scitotenv.2022.155924
- A Study on Monitoring OH Radicals Using Optical Measurement Techniques M. Jeon https://doi.org/10.31818/JKNST.2025.9.8.3.523
- Quantitative study on the interference of OH radicalmeasurement in the air pollution complex X. Ma et al. https://doi.org/10.1360/TB-2022-0581
- COSMOGENIC14CO FOR ASSESSING THE OH-BASED SELF-CLEANING CAPACITY OF THE TROPOSPHERE C. Brenninkmeijer et al. https://doi.org/10.1017/RDC.2021.101
- Comparison of Isoprene Chemical Mechanisms with Chamber and Field Observations W. Brune et al. https://doi.org/10.1021/acsearthspacechem.4c00196
- Impact of temperature-dependent non-PAN peroxynitrate formation, RO2NO2, on nighttime atmospheric chemistry M. Färber et al. https://doi.org/10.1039/D3CP04163H
Saved (final revised paper)
Latest update: 01 Jun 2026
Short summary
This study describes the implementation and characterization of the chemical modulation reactor (CMR) used in the laser-induced fluorescence instrument of the Forschungszentrum Jülich. The CMR allows for interference-free OH radical measurement in ambient air. During a field campaign in a rural environment, the observed interference was mostly below the detection limit of the instrument and fully explained by the known ozone interference.
This study describes the implementation and characterization of the chemical modulation reactor...
