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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-103
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-103
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  23 Apr 2020

23 Apr 2020

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A revised version of this preprint is currently under review for the journal AMT.

Implementation of an IBBCEAS technique in an atmospheric simulation chamber for in situ NO3 monitoring: characterization and validation for kinetic studies

Axel Fouqueau1, Manuela Cirtog1, Mathieu Cazaunau1, Edouard Pangui1, Pascal Zapf1, Guillaume Siour1, Xavier Landsheere1, Guillaume Méjean2, Daniele Romanini2, and Bénédicte Picquet-Varrault1 Axel Fouqueau et al.
  • 1LISA, UMR CNRS 7583, Université Paris-Est Créteil, Université de Paris, Institut Pierre Simon Laplace (IPSL), Créteil, France
  • 2LIPHY, UMR CNRS 5588, Université Grenoble Alpes, Grenoble, France

Abstract. An incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) technique has been developed for in situ monitoring of NO3 radicals at the ppt level in the CSA simulation chamber (at LISA). The technique couples an incoherent broadband light source centered at 662 nm with a high finesse optical cavity made of two highly reflecting mirrors. The optical cavity which has an effective length of 82 cm allows for up to 3 km of effective absorption and a high sensitivity for NO3 detection (up to 6 ppt for an integration time of 10 seconds). This technique also allows NO2 monitoring (up to 9 ppb for an integration time of 10 seconds). Here, we present the experimental setup as well as tests for its characterization and validation. The validation tests include an intercomparison with another independent technique (FTIR) and the absolute rate determination for the reaction trans-2-butene + NO3 which is already well documented in the literature. The value of (4.13 ± 0.45) x 10-13 cm3 molecule-1 s-1 has been found, which is in good agreement with previous determinations. From these experiments, optimal operation conditions are proposed. The technique is now fully operational and can be used to determine rate constants for fast reactions involving complex volatile organic compounds (with rate constants up to 10-10 cm3 molecule-1 s-1).

Axel Fouqueau et al.

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Axel Fouqueau et al.

Axel Fouqueau et al.

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Short summary
An incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) technique has been developed for in situ monitoring of NO3 radicals in the CSA simulation chamber (at LISA). The optical cavity allows a high sensitivity for NO3 detection up to 6 ppt for an integration time of 10 seconds. The technique is now fully operational and can be used to determine rate constants for fast reactions involving complex volatile organic compounds (with rate constants up to 10-10 cm3 molecule-1 s-1).
An incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) technique has been...
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