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\title{EXTENSIVE INVESTIGATION OF ROOM-TEMPERATURE CH$_3$C$^{14}$N-N$_2$ PRESSURE-BROADENING PARAMETERS IN THE 180--1400~GHz RANGE}

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\author{                      \FirstName F. \LastName ROHART$^{*}$,
                              \FirstName A. \LastName DUDARYONOK$^{**}$,
		   \underline{\FirstName L. \LastName ZOU}$^{*,***}$,
			      \FirstName L. \LastName MARGULES$^{*}$,
			      \FirstName N.~\LastName LAVRENTIEVA$^{**}$,
		   \underline{\FirstName J. \LastName BULDYREVA}$^{****}$}
\address{Laboratoire PhLAM - Physique des Lasers, Atomes et Mol\'{e}cules, UMR CNRS 8523, Universit\'{e} Lille, F-59000 Lille ($^{*}$);
Laboratory of Molecular Spectroscopy, V.E. Zuev Institute of Atmospheric Optics SB RAS, 1 Akademician Zuev sq., 634055 Tomsk, Russia ($^{**}$);
Universit\'{e} du Littoral C\^ote d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosph\`ere, F-59140, Dunkerque ($^{***}$);
Institut UTINAM, UMR CNRS 6213, Universit\'{e} de Franche-Comt\'{e}, 16 Route de Gray, F-25030 Besan\c{c}on cedex ($^{****}$)
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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Acetonitrile CH$_3$CN is a molecule of atmospheric interest, now included in the HITRAN database [1]. However, except for some experimental studies of line intensities, positions, broadening and shifting parameters [2,3], its line broadening by many atmospheric gases remains incomplete. The case of N$_2$-broadening is the most important since nitrogen is the main perturbing gas in the atmospheres of Earth and Titan. In the present work we address N$_2$-broadening coefficients of CH$_3$C$^{14}$N rotational transitions for a wide range of rotational quantum numbers $J$ and $K$. 

Experiments were performed  with a frequency-modulated spectrometer operating in the 180--1400 GHz range and consisting of a 10--20 GHz frequency synthesizer followed by a frequency multiplier chain based on solid-state devices, a 1.1 meter long absorption inox cell and a bolometric detection.
Measurements were done at room temperature, with the active-gas pressure equal to 2--5 mTorr and the buffer-gas pressure 50--600 mTorr.
Rotational lines with $J$ = 9, 12, 15, 21, 27, 33, 42, 48, 63, 69, 75 and $K \leq$15, located in the region 184--1390 GHz, have been studied in detail. All recorded lines exhibit clear departures from the usual Voigt profile and have been analyzed using the more realistic Speed-Dependent Voigt profile. The Voigt profile has been also employed because of its continuing use in atmospheric applications.

Measured values are compared to theoretical estimates obtained by the semi-empirical method [4] successfully applied previously to other symmetric tops CH$_3$X [5] and well appropriate for the CH$_3$CN-N$_2$ case because of strong electrostatic interactions due to the large dipole moment of the absorbing molecule. Being fitted on experimental $J$- and $K$-dependent values of pressure-broadening coefficients, the theoretical model parameters enable computations of line-shape parameters for enlarged ranges of rotational quantum numbers.
\vspace{0.5cm}\\
\begin{small}
\mbox{[1]} I.E. Gordon et al., JQSRT 277, 107949 (2022).\\
\mbox{[2]} C.P. Rinsland et al., JQSRT 109, 974 (2008).\\
\mbox{[3]} J.-M. Colmont et al., J. Mol. Spectrosc. 238, 98 (2006).\\
\mbox{[4]} A.D. Bykov, N.N. Lavrentieva, L.N. Sinitsa, Mol. Phys. 102, 1653 (2004).\\
\mbox{[5]} A.S. Dudarynok, N.N. Lavrentieva,  J. Buldyreva, JQSRT 130, 321 (2013).
\end{small}


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