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\documentclass[11pt]{article}

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\title{SYSTEMATIC INCREASE OF WATER VIBRATIONAL EXCITATION IN AR--WATER VAN DER WAALS COMPLEX}

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\author{\underline{\FirstName R. \LastName GLORIEUX}}
\address{Institute of Condensed Matter and Nanosciences, Universit\'{e} catholique de Louvain, Chemin du cyclotron, 2 1348 Louvain-la-Neuve, Belgium.}

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\author{\FirstName N. \LastName MOAZZEN-AHMADI,
  \FirstName A.~J. \LastName BARCLAY}
\address{Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calagry, Alberta T2N 1N4, Canada.}

\author{\FirstName M. \LastName HERMAN,
  \FirstName T. \LastName VANFLETEREN}
\address{Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Facult\'{e} des Sciences, Universit\'{e} libre de Bruxelles (ULB), 50 ave. F-D Roosevelt, B-1050, Brussels, Belgium.}

\author{\FirstName A.~R.~W. \LastName MCKELLAR}
\address{National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada.}

\author{\FirstName B.~M. \LastName HAYS}
\address{Universit\'{e} de Lille, CNRS, UMR8523-PhLAM-Physique des Lasers Atomes et Mol\'{e}cules, F-59000 Lille, France.}

\author{\FirstName A.~S. \LastName BOGOMOLOV,
  \FirstName C. \LastName LAUZIN}
\address{Institute of Condensed Matter and Nanosciences, Universit\'{e} catholique de Louvain, Chemin du cyclotron, 2 1348 Louvain-la-Neuve, Belgium.}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\category {11,3}
\begin{document}

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\index{Complexes}
\index{Water}
\index{Infrared}
\index{Rovibrational}

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The Ar--water van der Waals complex is one of the most studied complexes. This work focuses on new results obtained in the mid- and near-infrared. Complexes were formed in a pulsed slit supersonic jet expansion and were probed using sensitive laser-based absorption spectrometers. In this talk, I will present the rotationally resolved spectra of the Ar--water as a function of the number of vibrational quanta of excitation in the water molecule. Note that the dissociation energy of Ar--D$_2$O is evaluated to be below $100$~cm$^{-1}$ ($D_0 \sim 95$~cm$^{-1} \sim 12$~meV).\footnote{S. Wang, S. He, L. Dai, E. Feng, and W. Huang, \textit{J. Chem. Phys.} \textbf{142}, 224307 (2015).} We started by probing the 1OD stretch region of Ar--D$_2$O, i.e. the $(\nu_1',\nu_2',\nu_3') \leftarrow (\nu_1'',\nu_2'',\nu_3'') = (0,0,1) \leftarrow (0,0,0)$ vibrational band, where $\nu_1$, $\nu_2$, and $\nu_3$ are the vibrational quantum numbers of the isolated water molecule. This range is close to $30$ times the dissociation energy. The spectra were assigned and observed perturbations are discussed following previous study on Ar--H$_2$O.\footnote{D. J. Nesbitt, and R. Lascola, \textit{J. Chem. Phys.} \textbf{97}, 8096 (1992).} After making improvements on the FANTASIO experimental set-up,\footnote{A. S. Bogomolov, A. Roucou, R. Bejjani, M. Herman, N. Moazzen-Ahmadi, and C. Lauzin, \textit{Chem. Phys. Lett.} \textbf{774}, 138606 (2021).} we observed new bands in the 2OH stretch region of Ar--H$_2$O.\footnote{T. Vanfleteren, T. F\"{o}ldes, M. Herman, \textit{Chem. Phys. Lett.} \textbf{627}, 36-38 (2015).}$^,$\footnote{T. Vanfleteren, T. F\"{o}ldes, M. Herman, J. Li\'{e}vin, J. Loreau, and L. H. Coudert, \textit{J. Chem. Phys.} \textbf{147}, 014302 (2017).} In this region, the excitation energy is approximately $77$ times $D_0$.\footnote{D. Hou, Y.-T. Ma, X.-L. Zhang, and H. Li, \textit{J. Chem. Phys.} \textbf{144}, 014301 (2016).} Finally, preliminary results concerning the 3OD stretch excitation in Ar--D$_2$O ($83$ times $D_0$) will be presented.

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