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\documentclass[11pt]{article}

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

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\title{ON THE SPECTROSCOPY OF ACYLIUM- AND THIOACYLIUM IONS}

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\author{\underline{\FirstName S. \LastName THORWIRTH},
  \FirstName O. \LastName ASVANY, \FirstName T. \LastName SALOMON, \FirstName M. \LastName BAST, \\ \FirstName P. C. \LastName SCHMID, \FirstName S. \LastName SCHLEMMER}
\address{I. Physikalisches Institut, Universit\"at zu K\"oln, Z\"ulpicher Str. 77, 50937 K\"oln, Germany}

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%\author{\underline{\FirstName G. \LastName HHHHH-IIIIIII Jr},
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%  \underline{\FirstName L. \LastName MM NN PPPPPP}}
%\address{Address of the institution for the second author(s)}

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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 {7,8}
\begin{document}

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

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Acylium- and thioacylium ions, $R$-CO$^+$ and $R$-CS$^+$, are a class of
molecular ions of relevance for astrochemistry that have received relatively little
attention from molecular spectroscopy so far. Triggered by our first spectroscopic
study of the polyatomic HC$_3$O$^+$ and HC$_3$S$^+$ 
species,\footnote{\href{https://doi.org/10.1080/00268976.2020.1776409}{doi:10.1080/00268976.2020.1776409} S. Thorwirth, M. E. Harding, O. Asvany, S. Br\"unken, P. Jusko, K. L. K. Lee, T. Salomon, M. C. McCarthy, and S. Schlemmer,
Descendant of the X-ogen carrier and a "mass of 69": Infrared action spectroscopic detection of HC$_3$O$^+$ and HC$_3$S$^+$,
Mol. Phys. 118, e1776409 (2020).} it was not long
until these two ions as well as the methyl variant CH$_3$CO$^+$ were detected in space.\footnote{\href{https://doi.org/10.1051/0004-6361/202040076}{doi:10.1051/0004-6361/202040076} J. Cernicharo, C. Cabezas, S. Bailleux, L. Margul\`es, R. Motiyenko, L. Zou, Y. Endo, C. Berm\'udez, M. Ag\'undez, N. Marcelino, B. Lefloch, B. Tercero, and P. de Vicente, Discovery of the acetyl cation, CH$_3$CO$^+$, in space and in the laboratory, Astron. Astrophys. 46, L7 (2021) and references therein.}
Here, we would like to present a status report on the spectroscopic
studies of acylium- and thioacylium ions at Cologne that make use of various action spectroscopy schemes in combination with state-of-the-art ion trap machinery.

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