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\title{MILLIMETER-WAVE SPECTROSCOPY OF AMMONIA-WATER WEAKLY BOUNDED COMPLEX}

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\author{\underline{\FirstName P. \LastName GYAWALI},
  \FirstName R.~A. \LastName MOTIYENKO}
\address{UMR 8523 - PhLAM - Physique des Lasers Atomes et Mol\'ecules,
Univ. Lille, CNRS, F-59000 Lille, France}

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

\author{\FirstName I. \LastName KLEINER}
\address{Universit\'e Paris Cit\'e and Univ. Paris Est Creteil, CNRS, LISA, 75013, Paris, France}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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The broadband rotational spectra of ammonia-water (NH$_3$-H$_2$O) complex were measured in the frequency range from 50 to 250~GHz using a supersonic-jet emission spectrometer. The NH$_3$-H$_2$O complex exhibits two large amplitude motions (LAMs): almost free internal rotation of ammonia owing to very low torsional barrier ($\approx 10$~cm$^{-1}$), and the inversion of water characterized by relatively high barrier ($\approx 700$~cm$^{-1}$). 
%Because of the latter and taking Doppler-limited resolution of spectrometer into account, we could not observe inversion tunneling splittings of $a$-type rotational transitions. 
In total, about 150 rotational transitions of NH$_3$-H$_2$O were assigned in this study. They were fitted together with the data from previous studies\footnote{P.~A.~Stockman, R.~E.~Bumgarner, S.~Suzuki, \& G.~A.~Blake, J.~Chem.~Phys. 96, 2496 (1992); G.~T.~Fraser \& R.~D.~Suenram, J.~Chem.~Phys. 96, 7287 (1992)} using the ``hybrid'' Hamiltonian approach\footnote{I.~Kleiner \& J.~T.~Hougen, J. Mol. Spectrosc. 368, 111255 (2020)}. The analysis is in progress as we are currently trying to modify the characteristics of supersonic expansion in order to achieve higher rotational temperatures and consequently to measure higher $K_a$ transitions. We also present recent modification of the spectrometer that allowed us to improve spectral resolution and observe water inversion tunneling splittings in pure rotational transitions of NH$_3$-H$_2$O. The latest results will be discussed.

\emph{This work has been supported by the French PN LEFE and ANR Labex CaPPA through the PIA under Contract No. ANR-11-LABX-0005-01}

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