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\documentclass[11pt]{article}

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

\newcommand{\CO}{\mbox{$^{12}\textrm{C}^{16}\textrm{O}$}}
\newcommand{\av}{\mbox{$\textrm{a}^{3}\Pi$(\emph{v} = 3)}}

\newcommand{\cm}{\mbox{cm$^{-1}$}}

\newcommand{\at}{\mbox{$\textrm{a}^{3}\Pi$}}
\newcommand{\e}{\mbox{$\textrm{e}^{3}\Sigma^{-}$}}
\newcommand{\ap}{\mbox{$\textrm{a'}^{3}\Sigma^{+}$}}
\newcommand{\D}{\mbox{$\textrm{D}^{1}\Delta$}}
\newcommand{\dt}{\mbox{$\textrm{d}^{3}\Delta$}}
\newcommand{\I}{\mbox{$\textrm{I}^{1}\Sigma^{-}$}}

\newcommand{\aX}{\mbox{$\textrm{a}^{3}\Pi-\textrm{X}^{1}\Sigma^{+}$}}

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\title{VUV-FT SPECTROSCOPY OF THE \aX\ CAMERON BAND SYSTEM IN THE CO MOLECULE}

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\author{\FirstName A. \LastName STASIK}
\address{Materials Spectroscopy Laboratory, Institute of Physics, University of Rzesz\'{o}w, Poland}

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\author{  \FirstName A. N. \LastName HEAYS}
\address{J. Heyrovsky Institute of Physical Chemistry, Prague, Czech Republic}
\author{  \FirstName W. \LastName UBACHS}
\address{Department of Physics and Astronomy, and LaserLaB, Vrije Universiteit, Netherlands}
\author{  \FirstName R. W. \LastName FIELD}
\address{Department of Chemistry, Massachusetts Institute of Technology, USA}
\author{  \FirstName M. I. \LastName MALICKA}
\address{The Faculty of Mathematics and Applied Physics, Rzesz\'{o}w University of Technology, Rzesz\'{o}w, Poland}
\author{  \FirstName N. \LastName DE OLIVEIRA}
\address{Synchrotron SOLEIL, France}
\author{  \FirstName S. \LastName RYZNER, \FirstName W. \LastName SZAJNA, \underline{\FirstName R. \LastName HAKALLA}}
\address{Materials Spectroscopy Laboratory, Institute of Physics, University of Rzesz\'{o}w, Poland}

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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]{}
\renewcommand{\headrulewidth}{0.6pt}
\renewcommand{\footrulewidth}{0.6pt}

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\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {8,2}
\begin{document}

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

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\par The study of carbon monoxide is of considerable importance in modelling the evolution of nebulae, stars, planets and exoplanets, as well as entire galaxies, due to the second-largest abundance of this molecule in the universe after the molecular hydrogen.\footnote{\href{https://doi.org/10.1146/annurev.astro.42.053102.134010}{doi:10.1146/annurev.astro.42.053102.134010}, E. F. Van Dieshoeck, \textit{Annual Review of Astronomy and Astrophysics}, \textbf{42}, 119-167, (2004).} Cameron system, \aX\, is the subject of very intense study  to understand of a daylight of the Mars atmosphere.\footnote{\href{http://dx.doi.org/10.1016/j.pss.2011.08.010}{doi:10.1016/j.pss.2011.08.010}, S.K. Jain \textit{et al.}, \textit{Planetary and Space Science}, \textbf{63-64}, 110-112 (2012).}$^,$\footnote{\href{http://dx.doi.org/10.1016/j.icarus.2014.09.051}{doi:10.1016/j.icarus.2014.09.051}, A. Stiepen \textit{et al.}, \textit{Icarus}, \textbf{245}, 295-305, (2015).}$^,$\footnote{\href{http://dx.doi.org/10.1016/j.icarus.2015.09.023}{doi:10.1016/j.icarus.2015.09.023}, L. Soret \textit{et al.}, \textit{Icarus}, \textbf{264}, 398-406, (2016).}

\par This work is aimed to obtain the highest energy, non-perturbed band among all the hot bands of the \aX\ Cameron system in the CO molecule, namely the (3, 0), as well as to precisely analyze the \av\ vibrational level. For this purpose, the VUV-FT absorption technique was used by employing the wave-front-division spectrometer working as the end station on the DESIRS beamline (SOLEIL synchrotron).\footnote{\href{http://dx.doi.org/10.1103/PhysRevA.84.052509}{doi:10.1103/PhysRevA.84.052509}, A. J. de Nijs \textit{et al.}, \textit{Physical Review A}, \textbf{84}, 052509, (2011).}$^,$\footnote{\href{http://dx.doi.org/10.1107/S1600577516006135}{doi:10.1107/S1600577516006135}, N. de Oliveira \textit{et al.}, \textit{Journal of Synchrotron Radiation}, \textbf{23}, 887-900, (2016).} The wavenumbers of the 9 rotational branches of the band under consideration were thus obtained. Based on the effective Hamiltonian and using the PGOPHER program\footnote{\href{http://dx.doi.org/10.1016/j.jqsrt.2016.04.010}{doi:10.1016/j.jqsrt.2016.04.010}, C. Western, \textit{Journal of Quantitative Spectroscopy and Radiative Transfer}, \textbf{186}, 221-242, (2017).}, the accurate rotational and $\Lambda$-doubling molecular constants as well as spin-orbit, spin-rotation, and off-diagonal spin-spin coupling constants of the \av\ level were obtained. The ro-vibronic terms of \av, based on the experimental transition frequencies, were calculated.

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