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\documentclass[11pt]{article}

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

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\title{NON-LTE SPECTROSCOPY OF METHANE RECORDED IN A HYPERSONIC FLOW}

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\author{\FirstName E. \LastName DUD\'AS,
  \FirstName N. \LastName SUAS-DAVID, 
  \FirstName L. \LastName ROLLAND,
  \underline{\FirstName R. \LastName GEORGES}}
\address{IPR, Universit\'e de Rennes, UMR6251 CNRS, F-35042, France}

\author{\FirstName B. \LastName VISPOEL}
\address{Research Unit Lasers and Spectroscopies (LLS), Institute of Life, Earth and Environment (ILEE),  University of Namur (UNamur), 61 rue de Bruxelles, B-5000, Namur, Belgium}

\author{\FirstName R. R. \LastName GAMACHE}
\address{Department of Environmental, Earth, and Atmospheric Sciences University of Massachusetts Lowell, Lowell, MA 01854 USA}

\author{\FirstName M. \LastName REY}
\address{GSMA, UMR 7331, Universit\'e de Reims, Reims, France}

\author{\FirstName V. \LastName TYUTEREV,
	\FirstName A. \LastName NIKITIN}
\address{V.E. Zuev Institute of Atmospheric Optics SB RAS, Tomsk, 634055, Russia}

\author{\FirstName S. \LastName KASSI}
\address{LIPhy, UMR 5588, Universit\'e Grenoble Alpes, Saint Martin d'H\`eres, France}

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

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\category {8,3}
\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).
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Laboratory spectroscopic data is essential for the modeling of hot exoplanet atmospheres, since molecules such as methane, a major component of hot-Jupiter-type exoplanet atmospheres, have a complex vibrational energy structure that makes computational predictions difficult at high temperatures for ro-vibrational transitions involving highly excited vibrational sates. To better inform line lists used in radiative transfer modelling, the ro-vibrational spectrum of methane has been recorded in the tetradecad region between 1.7 and 1.65 $\mu$m (5880-6060 cm$^{-1}$) through non-local thermodynamic equilibrium (non-LTE) cavity ringdown spectroscopy (CRDS)\footnote{\href{https://doi.org/10.1063/5.0003886}{doi:10.1063/5.0003886}, E. Dud\'as \textit{et al.}, J. Chem. Phys., 152, 134201 (2020).}. Non-LTE conditions, characterized by a low rotational temperature (39 K) and a high vibrational temperature (up to 1130 K), have been obtained by hypersonic expansion of a pre-heated mixture of argon and methane in a contoured Laval nozzle. The high vibrational temperature increases the intensity of new hot bands, while the very low rotational temperature greatly simplifies their rotational structure, thus facilitating their identification. A close comparison of the recorded CRDS data to the TheoReTS database reveals both inefficient vibrational relaxation between polyads and efficient vibrational relaxation between vibrational states forming a polyad. These effects result in an overpopulation of the lowest vibrational energy level of each polyad, an effect not widely currently incorporated in non-LTE radiative transfer models. A series of new hot band transitions originating from the pentad and octad polyads were assigned and are provided as a line list for use in future databases\footnote{\href{https://doi.org/10.1016/j.icarus.2022.115421 }{doi:10.1016/j.icarus.2022.115421}, E. Dud\'as \textit{et al.}, Icarus, 394, 115421 (2023).}.

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