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\documentclass[11pt]{article}

\usepackage{hrms}  %% Page settings, style ... for the HRMS abstract book.

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\title{CO$_2$- AND N$_2$- COLLISIONAL BROADENING COEFFICIENTS OF LINES IN THE $\nu_4$ BAND OF METHANE}

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\author{\underline{\FirstName J. \LastName CL\'EMENT},
  \FirstName B. \LastName VISPOEL, 
  \FirstName O. \LastName BROWET, 
  \FirstName M. \LastName LEP\`ERE}
\address{Research Unit Lasers and Spectroscopies (LLS), Institute of Life and Environment (ILEE), University of Namur, 61, rue de Bruxelles,Namur, Belgium}

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\author{\FirstName M. \LastName MANGOLD,
  \FirstName J. \LastName HAYDEN,
  \FirstName P. \LastName ALLMENDINGER,
  \FirstName A. \LastName HUGI}
\address{IRsweep AG, Laubisruetistrasse 44, St\"{a}fa, Switzerland}

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\usepackage{fancyhdr}
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
\fancyfoot[C]{}
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\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {3,15}
\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).

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\index{Dual-comb spectrometer}
\index{collisional broadening coefficients}

%% Place the body of your abstract below.
%A good knowledge of the spectroscopic parameters is of major importance to determine
%the physico-chemical atmospheric characteristics (such as pollutant concentrations,
%vertical profiles of concentration. . . ) from remote sensed spectra.

Remote sensing is a powerful tool to study planetary atmospheres. It uses the reflected or emitted radiation, captured by ground-based or space stations, to determine the physico-chemical characteristics of an atmosphere. It requires to compute the radiative transfer, which needs spectroscopic parameters. The constant improvements of the remote sensing instruments have pushed the need for high-resolution molecular spectroscopy. High accuracy spectroscopic data, such as collisional half-widths, need to be measured and studied in various spectral regions to keep up the pace with remote sensing community requirements.\\

This study uses the first mid-infrared dual comb spectrometer based on
quantum cascade lasers\footnote{\href{https://doi.org/10.1364/CLEO_SI.2015.SW1G.3}{doi:10.1364/CLEO\_SI.2015.SW1G.3}, G. Villares et al., "Dual-comb spectroscopy based on quantum-cascade-laser frequency combs", Nature Communications, 5(1):5192, (2014).} in the new step sweep mode which opens the door to high resolution\footnote{\href{https://doi.org/10.1016/j.jqsrt.2022.108239}{doi:10.1016/j.jqsrt.2022.108239}, M. Lep\`{e}re et al., "A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy", Journal of Quantitative Spectroscopy and Radiative Transfer, 287:108239, (2022).}. Our very recent improvements of this instrument allows to obtain higher quality spectra in a lower amount of time. It helps to improve the analysis of absorption lines and the determination of collisional effects on line shapes. \\

In this work, we studied collisional half-widths of methane lines broadened by N$_2$ and CO$_2$ in the $\nu_4$ vibrational band at room temperature. These parameters were deduced from the fits on the experimental line profiles using the Voigt and the Rautian-Sobel'man models. Our well-suited spectrometer and its recent improvements grant the observation of beyond-Voigt effects related to the molecular confinement. The experimental results were then compared, when possible, to the literature.



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