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\documentclass[11pt]{article}

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

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\title{SPECTROSCOPIC STUDY OF BUFFER GAS COOLED METHANOL IN THE 2OH STRETCHING RANGE}

%% Note that \author and \address macros must be paired.
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%% The name(s) of author(s) presenting the work is(are) usually underlined.
\author{\underline{\FirstName A. \LastName LIBERT}}
\address{Institute of Condensed Matter and Nanosciences,
Universit\'{e} catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium AND Royal Belgian Institute for Space Aeronomy, Brussels, Belgium}
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\author{\FirstName A. \LastName ROUCOU}
\address{Universit\'{e} du Littoral C\^{o}te d'Opale, UR4493, LPCA, Laboratoire de Physico-Chimie de l'Atmosph\`{e}re, F-59140 Dunkerque, France}

\author{\FirstName B. \LastName HAYS, \FirstName R. \LastName GLORIEUX}
\address{Institute of Condensed Matter and Nanosciences,
Universit\'{e} catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium}

\author{\FirstName S. \LastName ROBERT}
\address{Royal Belgian Institute for Space Aeronomy, Brussels, Belgium}

\author{\FirstName B. \LastName FABRE}
\address{Universit\'{e} de Bordeaux, CNRS, CEA, CELIA, UMR5107, F33405 Talence, France}

\author{\FirstName S. \LastName KASSI}
\address{Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France}

\author{\FirstName X. \LastName URBAIN, \FirstName C. \LastName LAUZIN}
\address{Institute of Condensed Matter and Nanosciences,
Universit\'{e} catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium}
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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 {3,13}
\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
%% Remove the %% to account for the index item(s)
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\index{near-infrared}
\index{pattern}
\index{methanol}
\index{buffer gas cooling}
\index{cavity ring-down spectroscopy}

%% Place the body of your abstract below.
Methanol ($\mathrm{CH}_3\mathrm{OH}$) is a six-atoms asymmetric top molecule presenting internal rotation. The size of this molecule and the presence of a large amplitude motion lead to a dense rotational structure. This structure gets even more complicated when one goes up in energy with vibrational excitations. Due to its complicated spectrum, this molecule remains poorly known, especially in the near-infrared. This frequency range was recently explored by Svoboda \textit{et al.}(\textit{Phys. Chem. Chem. Phys.}, \textbf{17} (2015) 15710) and by Rakvsk\'{y} \textit{et al.} (\textit{Phys. Chem. Chem. Phys.}, \textbf{23} (2021) 20193), probing the 2OH stretching vibration overtone around 7200 $\mathrm{ cm}^{-1}$. 

In this contributed talk, we will present the measurement of the full 2$\nu$1 vibration overtone around 7200 $\mathrm{ cm}^{-1}$ cooled down to 20~K with a buffer gas cooling setup coupled to a Cavity ring down spectrometer with a sensitivity of $\alpha_{\mathrm{min}}=2\times 10^{-10} \mathrm{ cm}^{-1}$. The two elements of the built in-house apparatus are first briefly introduced. The assignment procedure is then detailed. It is based on the extension of the ground state combination differences method (GSCD) to all the allowed transitions that lead to a same upper energy state. Indeed, these transitions form a unique pattern spaced on the wavenumber axis by the differences in energy between the involved lower energy states. This method was first presented by Rakvsk\'{y} \textit{et al}. We discuss the use of the intensities as an additional criterion to decide between correct assignments and fortuitous detection of the pattern on the experimental spectrum.

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