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\documentclass[11pt]{article}

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\title{SELF-BROADENING COEFFICIENTS FOR FUNDAMENTAL AND HOT BANDS OF ACETYLENE IN THE 1300 CM$^{-1}$ REGION}

%% Note that \author and \address macros must be paired.
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\author{\underline{\FirstName N. \LastName DRICOT},
  \FirstName J. \LastName CL\'{E}MENT,
  \FirstName O. \LastName BROWET,
  \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}


%% The \FirstName and \LastName macros are mandatory for each author
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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{Acetylene}
\index{Mid-Infrared}
\index{Line shape}
\index{Collisional broadening}
\index{Dual-Comb Spectroscopy}

%% Place the body of your abstract below.
Acetylene is one of the most common hydrocarbons present in Eath's atmosphere\footnote{
\href{http://dx.doi.org/10.1007/s00340-010-4027-5}{doi:10.1007/s00340-010-4027-5}
F.M. Schmidt \textit{et al.}, "Direct detection of acetylene in air by continuous wave cavity ring-down spectroscopy", Applied Physics B Lasers and Optics, \textbf{101}, 671--682 (2010)
} which origiantes mainly from human activities\footnote{
\href{http://dx.doi.org/10.1016/S1352-2310(96)00266-X}{doi:10.1016/S1352-2310(96)00266-X}
A.M. Mohan Rao \textit{et al.}, "Non-methane hydrocarbons in industrial locations of Bombay", Atmospheric Environment, \textbf{31}(7), 1077--1085 (1997)
}, but also from natural phenomena\footnote{
\href{http://dx.doi.org/10.1038/333051a0}{doi:10.1038/333051a0}
M. Kanakidou \textit{et al.}, "Marine source of atmospheric acetylene", Nature, \textbf{333}, 51--52 (1988)
}. Because of its presence in combustion processes, it can be used as marker for antropogenic pollution monitoring. C$_2$H$_2$ was also detected in planetary atmospheres inside and outside our solar system, as well as in interstellar medium (see review in Ref\footnote{
\href{http://dx.doi.org/10.1093/mnras/staa229}{doi:10.1093/mnras/staa229}
K.L. Chubb \textit{et al.}, "ExoMol molecular line lists - XXXVII. Spectra of acetylene", Monthly Notices of the Royal Astronomical Society, \textbf{493}(2), 1531--1545 (2020)
}). The computation of transfer radiative models and opacities requires accurate spectroscopic data. In particular, the line shape parameters are the least well known.

In this study, the self-broadening coefficients were determined for acetylene lines in the 1300~cm$^{-1}$ spectral region. The measurements were performed at room temperature using a high-resolution mid-infrared dual comb spectrometer based on quantum cascade lasers, that is well suited for line shape parameter measurements\footnote{
\href{http://dx.doi.org/10.1016/j.jqsrt.2022.108239}{doi:10.1016/j.jqsrt.2022.108239}
M. Lep\`{e}re \textit{et al.}, "A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy", Journal of Quantitative Spectroscopy and Radiative Transfer, \textbf{287}, 108239 (2022)
}. Thanks to a specifically designed absorption cell, transitions in the $\nu_4+\nu_5$ fundamental and two hot bands were studied. The obtained results exhibit the expected smooth variation with respect to the rotational quantum number J. To the best of our knowledge, it is the first time that the self-broadening coefficients were directly determined for the two studied hot bands. The results for the fundamental band are in good agreement with literature.

\vfill

Acknowledgements: The authors thank the IRsweep company for the support during the measurements performed with the dual comb spectrometer.

%\footnote{
%\href{http://dx.doi.org/10.1016/j.jqsrt.2022.108239}{doi:10.1016/j.jqsrt.2022.108239}
%M. Lep\`{e}re \textit{et al.}, "A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy", Journal of Quantitative Spectroscopy and Radiative Transfer, \textbf{287}, 108239 (2022)
%}


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