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\documentclass[11pt]{article}

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


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\title{ACTION SPECTROSCOPY STUDY OF (H$_2$O-X)$^+$ COMPLEXES IN THE OVERTONE RANGE}

\author{\underline{\FirstName J.~\LastName FR\'{E}REUX},
  \FirstName B.~\LastName TOMASETTI ,
  \FirstName G.~\LastName VANLANCKER ,
  \FirstName A.~\LastName DELCORTE ,
  \FirstName X.~\LastName URBAIN and
  \FirstName C.~\LastName LAUZIN}
\address{Institute of Condensed Matter and Nanosciences,
Universit\'{e} catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium}
%% Note that \author and \address macros must be paired.
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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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\category {3,7}
\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).

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\index{\ce{H2O+} complexes}
\index{Vibrational spectroscopy}

%% Place the body of your abstract below.
H$_2$O$^+$ plays a role in the ion chemistry of the lower atmosphere and acts as a nucleation center\footnote{\href{https://doi.org/10.1021/cr5003479}{doi:10.1021/cr5003479}, Shuman, N. S., Hunton, D. E., \& Viggiano, A. A. (2015). Ambient and modified atmospheric ion chemistry: From top to bottom. Chemical reviews, 115(10), 4542-4570.}. In this talk I will present new results concerning (H$_2$O-X)$^+$ complexes, with X $=$ Ar, CO$_2$ and N$_2$O. These complexes are produced using a supersonic expansion and an electron beam. Photo-fragmentation spectroscopy is performed with an OPO laser in the near-IR (1000-2100 nm) and by monitoring the signal of H$_2$O$^+$ fragments as a function of the laser wavelength. New vibrational bands will be reported. The results concerning (H$_2$O-Ar)$^+$ will be compared with previous results obtained in the literature\footnote{\href{https://doi.org/10.1063/1.4998419}{doi:10.1063/1.4998419}, Wagner, J. P., McDonald, D. C., \& Duncan, M. A. (2017). Near-infrared spectroscopy and anharmonic theory of the H2O+ Ar1, 2 cation complexes. The Journal of chemical physics, 147(10), 104302.}. Tentative assignment of the observed bands will be performed by a careful comparison between the different complexes. Finally, I will present the status of our efforts in the production of very large ionic clusters, with pure (Ar)$_n^+$ and mixed clusters (H$_2$O$_m$-Ar$_n$)$^+$ containing up to thousands of units.\\


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