%%
%% Sample TeX file for the HRMS Dijon 2023 abstracts
%% 
%% Lines (or parts of) beginning with at least one '%' are comments 
%% and are silently ignored by LaTeX
%%
%% Codings beginning with \ are LaTeX macros or commands.
%% They are used to tell the LaTeX parser how to format the document.
%% All the macros below are mandatory.
%%
%% Various information about latex may be found at
%%
%%   http://en.wikibooks.org/wiki/LaTeX
%%
%% *-----------------------------------------------------------------------------------------*
\documentclass[11pt]{article}

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


%% *-----------------------------------------------------------------------------------------*

\title{SUB-MILLIMETER WAVE SPECTROSCOPY OF THE CH$_2$CHO RADICAL}

%% Note that \author and \address macros must be paired.
%% The names of authors must also appear IN CAPITALS.
%% The name(s) of author(s) presenting the work is(are) usually underlined.

%\author{\underline{\FirstName A.~B. \LastName CCCCCCCCCC},
 % \FirstName D. \LastName EE FFFFF}
%\address{Address of the institution for the author(s)}

%% The \FirstName and \LastName macros are mandatory for each author
%% to make sure that the author index is properly auto-generated.
%% Otherwise, these macros do nothing in particular.

%% Add or remove \author and \address pair(s) below to suite your needs
\author{\underline{\FirstName R. \LastName CHAHBAZIAN},
  \underline{\FirstName M.-A. \LastName MARTIN-DRUMEL},
  \underline{\FirstName O. \LastName PIRALI}}
\address{Universit\'{e} Paris-Saclay, CNRS, Institut des Sciences Mol\'{e}culaires d'Orsay, 91400 Orsay, France}


%% *-----------------------------------------------------------------------------------------*

%% Place below other \usepackage{ ... }, if you need other packages.
%% See http://www.tug.org/texlive/doc.html for a description of available packages.

%% The macros below will change the page head and foot.
%% Please, do not modify the content of the \fancyhead macro nor the \fancyfoot line.
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
\fancyfoot[C]{}
\renewcommand{\headrulewidth}{0.6pt}
\renewcommand{\footrulewidth}{0.6pt}

%% The hyperref package allows the inclusion of hyperlinks in a document.
%% See the instructions for abstract submission for more details.
%% WARNING: Make sure that this package comes LAST since it redefines many LaTeX macros.
\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

%% *-----------------------------------------------------------------------------------------*

\category {4}
\begin{document}

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

%% Index macro(s): see the abstract samples and the instructions
%% \index{Item1}
%% \index{Item2}



The vinoxy radical (CH$_2$CHO) is a known product of the reaction involving O($^3$P) and unsaturated hydrocarbons as C$_2$H$_4$\footnote{A. Occhiogrosso, S. Viti, and N. Balucani, \textit{Monthly Notices of the Royal Astronomical Society}, \textbf{432} 3423 (2013)}. Its detection in the interstellar medium would help to understand the chemical networks involving large radicals. 

The CH$_2$CHO radical has previously been studied at high resolution by several authors. Its pure rotational spectrum was first investigated by Endo and Nakajima\footnote{Y. Endo and M. Nakajima, \textit{Journal of Molecular Spectroscopy} \textbf{301} 15 (2014)} using millimeter-wave spectroscopy and later by Endo, Saito, and Hirota\footnote{Y. Endo, S. Saito, and E. Hirota, \textit{The Journal of Chemical Physics} \textbf{83} 2026 (1985)} using Fourier-transform microwave spectroscopy and double resonance spectroscopy. Utkin et al.\footnote{Y. G. Utkin, J.-X. Han, F. Sun, H.-B. Chen, G. Scott, and R. F. Curl, \textit{The Journal of Chemical Physics}, \textbf{118} 10470 (2003)} studied its rovibrational spectra allowing for ground state combination differences.

In this work, we have measured the pure rotational spectrum of the vinoxy radical at millimeter- and sub-millimeter wavelengths (110--860 GHz). 
CH$_2$CHO was produced by H abstraction from acetaldehyde (CH$_3$CHO) using atomic fluorine in a double pass absorption cell at room temperature\footnote{G. Inoue and H. Akimoto, \textit{J. Chem. Phys.} \textbf{74} 425 (1981)}. A Zeeman-modulated spectrometer has been used to record the pure rotational transitions of the radical, in which a magnetic field is modulated in magnitude. As the recorded spectra are free from signals arising from closed-shell species, the setup allows spectral acquisition over wide spectral windows. 
We probed transitions involving relatively high values of the rotational quantum numbers $N''$ and $K_a''$ (up to 41 and 18 respectively). Their combination with available high-resolution literature data (pure rotation$^{1,2}$ and ground state combination difference from ro-vibration studies$^3$) led to an improvement of the modeling of the CH$_2$CHO rotational structure. This laboratory study provides complete spectroscopic information to search for CH$_2$CHO in various interstellar environments, from cold (e.g. typically 10 K for dense molecular clouds) to warm (e.g., $\sim$ 200 K for hot corinos) objects.

\end{document}
