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\documentclass[11pt]{article}

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

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\title{THE ROTATION-TUNNELING SPECTRUM OF 3-HYDROXYPROPENAL, HOCHCHCHO}

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\author{\underline{\FirstName H.~S.~P. \LastName M{\"U}LLER}}
\address{I.~Physikalisches Institut, Universit{\"a}t zu K{\"o}ln, 50937~K{\"o}ln, Germany}

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\author{\FirstName L. \LastName MARGUL{\`E}S, \FirstName R.~A. \LastName MOTIYENKO}
\address{UMR8523-PhLAM, Universit{\'e} de Lille, 59000 Lille, France}

\author{\FirstName J.-C. \LastName GUILLEMIN}
\address{Ecole Nationale Sup{\`e}rieure de Chimie de Rennes, Univ. Rennes, 35000 Rennes, France}

\author{\FirstName A. \LastName COUTENS}
\address{IRAP, Universit{\'e} de Toulouse 3 - CNRS, 31028 Toulouse, France}

\author{\FirstName J. \LastName J{\O}RGENSEN}
\address{Niels Bohr Institute, University of Copenhagen, 1350 Copenhagen, Denmark}

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

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\category {8,4}
\begin{document}

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%% Place the body of your abstract below.
3-Hydroxypropenal is the lower energy tautomeric form of propanedial, also known as malonaldehyde. 
It has two equivalent minima separated by a modest barrier which leads to two tunneling states 
separated by 647~GHz. Its rotational spectrum was analyzed in several studies, most recently through 
its $a$-type rotation-tunneling spectrum near 650~GHz.\footnote{\href{https://doi.org/10.1063/1.478296}
{doi: 10.1063/1.478296}, T. Baba et al., J. Chem. Phys. {\bf 110} 1999, 4131.} 

3-Hydroxypropenal was identified tentatively within the framework of the Protostellar Interferometric Line survey 
(PILS) toward the prototypical solar-type Class~0 young stellar system IRAS 16293$-$2422 carried out with the 
Atacama Large Millimeter/submillimeter Array (ALMA).\footnote{\href{https://doi.org/10.1051/0004-6361/202243038}
{doi: 10.1051/0004-6361/202243038}, A. Coutens et al., Astron. Astrophys. {\bf 660} 2022, L6.} 
The conclusions drawn from this study were severely limited by the fact that the rest frequencies of 
many potentially observable transitions were so uncertain that they could not be identified unambiguously. 
We have analyzed spectral recordings of 3-hydroxypropenal taken in Lille\footnote{This work was supported 
by the Programme National ''Physique et Chimie du Milieu Interstellaire'' (PCMI) of CNRS/INSU with INC/INP 
co-funded by CEA and CNES} that cover large parts of the 150$-$660~GHz region to overcome these limitations. 
Moderately large rotational parameters, the asymmetry of the molecule, and a plethora of rotation-tunneling 
interactions give rise to a very rich and quite complex spectrum. 
We will also present the astronomical implications.

\end{document}
