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%\title{TEMPERATURE DEPENDENCE OF COLLISIONAL LINE SHAPE PARAMETERS OF TRANSITIONS IN THE $\nu_4$ BAND OF METHANE DILUTED IN NITROGEN AND OXYGEN}
\title{TEMPERATURE DEPENDENCE OF N$_2$- AND O$_2$-COLLISIONAL PARAMETERS OF TRANSITIONS IN THE $\nu_4$ BAND OF METHANE}

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\author{\underline{\FirstName B. \LastName VISPOEL},
  \FirstName M. \LastName LEP\`{E}RE
}
\address{Research unit Lasers and Spectroscopies (LLS), Institute of Life, Earth and Environment (ILEE), University of Namur, 61, Rue de Bruxelles, Namur, Belgium}

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%\author{\underline{\FirstName G. \LastName HHHHH-IIIIIII Jr},
  %\FirstName J. \LastName KKKKKKKKKK,
  %\underline{\FirstName L. \LastName MM NN PPPPPP}}
%\address{Address of the institution for the second author(s)}

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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 {3,9}
\begin{document}

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

%% Index macro(s): see the abstract samples and the instructions
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\index{Methane}
\index{Mid-Infrared}
\index{Line shape}
\index{Temperature dependence}
\index{Beyond Voigt parameters}

%% Place the body of your abstract below.
Line shape parameters provide important information to understand and determine intermolecular potentials. They are also crucial data to compute radiative transfer models, for which the accuracy of the spectroscopic parameters are directly realated to the precision of retrieved information from remote sensed spectra\footnote{
\href{http://dx.doi.org/10.1029/2009JD012968}{doi:10.1029/2009JD012968}
J.S. Delamere \textit{et al.}, "A far-infrared radiative closure study in the Arctic: Application to water vapor", Journal of Geophysical Research, \textbf{115}, D17106 (2010)
}. Many works (see Ref\footnote{
\href{http://dx.doi.org/10.1016/j.jqsrt.2018.03.016}{doi:10.1016/j.jqsrt.2018.03.016}
J.-M. Hartmann \textit{et al.}, "Recent advances in collisional effects on spectra of molecular gases and their practical consequences", Journal of Quantitative Spectroscopy and Radiative Transfer, \textbf{213}, 178-227 (2018)
}  and references therein) have shown that the Voigt model, widely used in the atmospheric community, does not reproduce accurately experimental line profile. Beyond-Voigt effects, such as the speed-dependence, need to be considered. Because the temperature varies with altitude in planetary atmospheres, the temperature dependence of the line shape parameters needs to be quantified.

In this work, line shape parameters at various temperatures were measured using a high-resolution quantum cascade laser spectrometer for $\nu_4$ band methane lines diluted in nitrogen and oxygen. The measurements were performed from low (150K)\footnote{
\href{http://dx.doi.org/10.1016/S0022-2852(03)00053-5}{doi:10.1016/S0022-2852(03)00053-5}
Ch. Lerot \textit{et al.}, "H$_2$-broadening coefficients in the $\nu_3$ band of CH$_3$D at low temperatures", Journal of Molecular Spectroscopy, \textbf{219}(2), 329--334 (2003)
} to high temperatures (600K)\footnote{
\href{http://dx.doi.org/10.1016/j.jms.2015.06.001}{doi:10.1016/j.jms.2015.06.001}
L. Fissiaux \textit{et al.}, "Infrared spectroscopy at high temperature : N$_2$- and O$_2$-broadening coefficients in the $\nu_4$ band of CH$_4$", Journal of Molecular Spectroscopy, \textbf{317}, 26--31 (2015)
} thanks to specific absorption cells that have a good temperature stability and no gradient of temperature along the absorption path. For each temperature, the line shape parameters were determined using a multi-spectrum technique considering the Voigt, Nelkin-Ghatak, Speed-Dependence Voigt and Speed-Dependence Nelkin-Ghatak profiles. The temperature dependence were deduced from the empirical power law and the physics based double power law (Gamache-Vispoel model\footnote{
\href{http://dx.doi.org/10.1016/j.jqsrt.2018.05.019}{doi:10.1016/j.jqsrt.2018.05.019}
R.R. Gamache \textit{et al.}, "On the temperature dependence of half-widths and line shifts for molecular transitions in the microwave and infrared regions", Journal of Quantitative Spectroscopy and Radiative Transfer, \textbf{217}, 440--452 (2018)
}). The results are compared to literature when possible.



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