Preprints
https://doi.org/10.5194/amt-2021-399
https://doi.org/10.5194/amt-2021-399

  01 Dec 2021

01 Dec 2021

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

MULTICHARME: A modified Chernin-type multi-pass cell designed for IR and THz long-path absorption measurements in the CHARME atmospheric simulation chamber

Jean Decker1, Éric Fertein1, Jonas Bruckhuisen1, Nicolas Houzel1, Pierre Kulinski1, Bo Fang2, Weixiong Zhao2, Francis Hindle1, Guillaume Dhont1, Robin Bocquet1, Gaël Mouret1, Cécile Coeur1, and Arnaud Cuisset1 Jean Decker et al.
  • 1Laboratoire de Physico-Chimie de l’Atmosphère, UR4493, LPCA, Université du Littoral Côte d’Opale, F-59140 Dunkerque, France
  • 2Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, Anhui, China

Abstract. We have developed MULTICHARME, a modified Chernin-type multi-pass cell especially designed for IR and THz long-path absorption measurements in the CHamber for Atmospheric Reactivity and Metrology of the Environment (CHARME). By measuring the output power using a near-IR diode-laser and a THz amplified multiplication chain, we have established that the effective reflectivity of MULTICHARME is better than 94 % over approximately three decades of frequency. Absorption measurements of N2O have been performed by probing highly excited rovibrational transitions in the near-IR and ground state rotational transitions at submillimetre wavelengths. In each case the linearity of the absorbance with the pathlengths was verified. Finally, we demonstrate that THz spectroscopy is able to study the isotopic composition of greenhouse polar gases such as N2O and to absolutely quantify stable (N2O) and reactive (O3) species at trace levels. Moreover, a THz monitoring at low pressure of the ozone decay in the chamber has been performed. The deduced ozone lifetime of 3.4 ± 0.1 h is shorter compared with previous measurements performed in CHARME at atmospheric pressure. For the first time, the ability of THz rotational spectroscopy to monitor, with a very high degree of selectivity, stable and reactive polar compounds at trace level in an atmospheric simulation chamber is demonstrated. However, the sensitivity of the THz monitoring needs to be improved to reach the atmospheric trace levels. For this purpose, it is necessary to figure out the baseline variations as well as possible induced by the multiple standing waves present in MULTICHARME.

Jean Decker et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-399', Anonymous Referee #1, 23 Dec 2021
  • RC2: 'Comment on amt-2021-399', Anonymous Referee #2, 04 Jan 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-399', Anonymous Referee #1, 23 Dec 2021
  • RC2: 'Comment on amt-2021-399', Anonymous Referee #2, 04 Jan 2022

Jean Decker et al.

Jean Decker et al.

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Short summary
We present and characterize a multiple pass system developed for the CHamber for Atmospheric Reactivity and Metrology of the Environment. This multi-pass cell allows to monitor atmospheric species at trace levels by high-resolution spectroscopy with long interaction path-lengths in the IR and for the first time in the Terahertz. Interesting prospects are highlighted in this frequency domain such as a high degree of selectivity or the possibility to monitor in real time atmospheric processes.