\documentclass[11pt]{article}

\usepackage{hrms}

\usepackage[utf8]{inputenc}%% *-----------------------------------------------------------------------------------------*

\title{SPECTROSCOPIC CHARACTERIZATION OF THE INTERNAL MOTIONS IN ACRYLIC AND CROTONIC ACID DERIVATIVES}

\author{\underline{\FirstName P. \LastName BUSCHMANN}, \FirstName K. G. \LastName LENGSFELD, \FirstName M. \LastName PAN, \FirstName J.-U. \LastName GRABOW}
\address{Institut fu\"r Physikalische Chemie und Elektrochemie, Leibniz Universita\"t Hannover, Callinstrasse 3A, 30167, Hannover, Germany}


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

%% 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}

%% WARNING: Make sure that this package comes LAST since it re-defines many LaTeX macros.
\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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

\category {4,12}
\begin{document}

\maketitle

The recent detection of cyano-substituted alkenes in a dark molecular cloud (TMC-1) of the interstellar medium\footnote{J. Cernicharo, R. Fuentetaja, C. Cabezas, M. Agundez, N. Marcelino, B. Tercero, J. R. Pardo, P. de Vicente, \textit{Astron. Astrophys.}, \textbf{663}, L5, 2022.} raises the question whether other corresponding alkene-based carboxylic acid derivatives are also formed and could be present in this astrochemical environment. For the simplest case, acrylic acid (three carbons), both the nitrile\footnote{F. F. Gardner, G. Winnewisser, \textit{ApJ}, \textbf{195},  L127-L130, 1975.} and the aldehyde\footnote{J. M. Hollis, P. R. Jewell, F. J. Lovas, A. Remijan, H. Mollendal, \textit{ApJ}, \textbf{610}, L21, 2004.} have been identified. However, it is interesting to note that acrolein, like many larger oxygen-rich molecules (COMs), tends to be observed in warmer regions nearby stars, unlike acrylonitrile, although small amounts have also been found in cold TMC-1. Of the alkene molecules with four carbon atoms, only crotonitrile and methacrylonitrile have been identified to date.
While methacrylic acid\footnote{S. Herbers, D. Wachsmuth, D. A. Obenchain, J.-U. Grabow, \textit{J. Mol. Spectrosc.}, \textbf{343}, 96-101, 2018.} and its methyl ester methyl methacrylate\footnote{S. Herbers, P. Kraus, J.-U. Grabow, \textit{J. Chem. Phys.} \textbf{150}, 144308, 2019.} have been studied in our laboratory, we have now extended spectroscopic characterizations or reinvestigations to the remaining methyl ester of acrylic acid (methyl acrylate)\footnote{G. Williams , N. L. Owen, J. Sheridan, \textit{Trans. Faraday Soc.} \textbf{67}, 922-949, 1971.} and derivatives of crotonic acid (four carbon atoms). 
All of these molecules undergo internal rotation of one or two methyl groups. The resulting feature of the rotational spectrum (splitting of the rotational transitions into different components corresponding to different symmetry species) can lead to a decrease in the overall signal intensity, potentially complicating identification in radio astronomical data. This and a contextualization of the V$_3$ values are discussed.

\end{document}
