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\title{NEW LINE INTENSITIES FOR THE FAR INFRARED BANDS OF THE TRANS- AND CIS-CONFORMER OF
NITROUS ACID (HONO), NEW DETERMINATION OF THE TRANS-CIS CONFORMER BARRIER AND ITS
IMPACT ON THE ASTROPHYSICAL DETECTION OF NITROUS ACID IN PROTOSTELLAR CLOUDS}

\author{\FirstName W. \LastName TCHANA BETNGA, \underline{\FirstName F. \LastName KWABIA TCHANA}}
\address{Universit\'e Paris Cit\'e and Univ Paris Est Creteil, CNRS, LISA, F-75013 Paris, France}

\author{\FirstName A. \LastName PERRIN}
\address{Laboratoire de M\'et\'eorologie Dynamique/IPSL, UMR CNRS 8539, Ecole Polytechnique, Universit\'e Paris-Saclay, RD36, 91128 Palaiseau Cedex, France}

\author{\FirstName L. \LastName MANCERON}
\address{Ligne AILES, Synchrotron SOLEIL, L'Orme des Merisiers, St-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France}

\author{\FirstName J. \LastName VANDER AUWERA}
\address{Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), C.P. 160/09, Universit\'e Libre de Bruxelles, B-1050 Brussels, Belgium}

\author{\FirstName F. \LastName HINDLE}
\address{Laboratoire de Physico-Chimie de l'Atmosph\`ere, Universit\'e du Littoral C\^ote d'Opale, Dunkerque, France}

\author{\FirstName A. \LastName COUTENS}
\address{Institut de Recherche en Astrophysique et Plan\'etologie (IRAP), Universit\'e de Toulouse, UPS, CNRS, CNES, 9 av. du Colonel Roche, 31028 Toulouse Cedex 4, France}

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The first goal of this work is to improve the determination of the energy difference (\Delta$E_{Cis-Trans}$) between the ground vibrational state of the Cis- and Trans-HONO conformers of nitrous acid.
For this, high resolution spectra were recorded in the 50-200 cm$^{-1}$ spectral region at three different temperatures, 240, 270, and 296 K.
The relative line intensities for the B-type transitions of pure rotational bands of Trans-HONO and Cis-HONO achieved from our measurements were combined in least squares 
fit computations to those measured previously by Sironneau \textit{et al}.\footnote{Sironneau V, Flaud JM, Orphal J, Kleiner I, Chelin P. Absolute line intensities of HONO and DONO in the far-infrared and re-determination of the Energy Difference between the trans- and cis-species of nitrous acid. \textit{J Mol Spectrosc} 2010;\textbf{259}:100-104}
In this way, we could improve significantly the accuracy on the HONO conformer energy difference, with a value for \Delta$E_{Cis-Trans}$ = 95.8 $\pm$ 9.2 cm$^{-1}$ compared to { }^{SIR}\Delta$E_{Cis-Trans}$ = 99 $\pm$ 25 cm$^{-1}$ in the previous study of Sironneau \textit{et al}.
The second goal is to generate a line list with absolute line intensities for the pure rotational bands in the far infrared region of Trans-HONO and Cis-HONO, with both A- and B-type transitions. 
This new line list proved to be more faithful for an improved detection of HONO in Astrophysical objects\footnote{Coutens A, Ligterink NFW, Loison JC, Wakelam V, Calcutt H, Drozdovskaya MN, J$\o$rgensen JK, M$\rm\ddot u$ller HSP, Van Dishoeck EF, Wampfler SF. The ALMA-PILS survey: First detection of nitrous acid (HONO) in the interstellar medium. \textit{Astronomy \& Astrophysics} 2019;\textbf{623}:L13}.

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