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\title{VUV PHOTOIONIZATION SPECTROSCOPY OF 2-AMINO PROPIONITRILE}

\author{\underline{\FirstName H.R. \LastName HRODMARSSON}, \FirstName M. \LastName SCHWELL, \FirstName N. \LastName FRAY}
\address{Laboratoire Interuniversitaire des Syst\`emes Atmosph\'eriques, CNRS UMR 7583, Universit\'e Paris-Est Cr\'eteil et Universit\'e
Paris Cit\'e, IPSL, 61 av. G\'en\'eral de Gaulle, 94010 Cr\'eteil, France}

\author{\FirstName E.-L. \LastName ZINS}
\address{De la Mol\'ecule aux Nano-objets: R\'eactivit\'e, Interactions et Spectroscopies, CNRS UMR 8233, Sorbonne Universit\'e, 4 place Jussieu Tour 53, 75252 Paris cedex 05}

\author{\FirstName J.-C. \LastName GUILLEMIN}
\address{Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Universit\'e Rennes 1, 263 Avenue G\'en\'eral Leclerc, 35700 Rennes, France}


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  Aug. 28 - Sept. 1, 2023}}}
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\category {2,8}
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\index{VUV spectroscopy}
\index{Ab initio}
\index{C_2H_4N_2}


Astronomical searches for gas phase amino acids have so far been unsuccessful. Numerous tentative claims and subsequent debates 
on possible occurrence of these prebiotic compounds in interstellar gas have thus far been unconclusive. Since the conclusive 
non-detection of glycine\footnote{M.R. Cunningham, P.A. Jones, P.D. Godfrey, D.M. Cragg, I. Bains, M.G. Burton, P. Calisse, N.H.M. Crighton, 
S.J. Curran, T.M. Davis, J.T. Dempsey, B. Fulton, M.G. Hidas, T. Hill, L. Kedziora-Chudczer, V. Minier, M.B. Pracy, C. Purcell, 
J. Shobbrook, T. Travouillon, Mon. Not. R. Astron. Soc. 2007, 376, 1201-1210.} attention of astrochemists has turned to precursors 
of amino acids. One of those is amino acetonitrile (AAC; \chem{H_2C(NH_2)CN}) that has indeed been detected in Sagittarius B2(N) in 
2008\footnote{A. Belloche, K.M. Menten, C. Comito, H.S.P. Mueller, P. Schilke, J. Ott, S. Thorwirth, C. Hieret, Astron. Astrophys. 
2008, 482, 179-196.}. This molecule can be transformed into glycine by simple hydrolysis. Its VUV photoionization has been studied 
earlier by our group\footnote{A. Bellili, M. Schwell, Y. B\'enilan, N. Fray, M.-C. Gazeau, M. Mogren Al-Mogren, J.-C. Guillemin, L. Poisson,
 M. Hochlaf, J. Mol. Spectrosc. 2015, 315, 196-205.}.
Here we present a VUV spectroscopic study of 2-amino propionitrile (2-APN; \chem{HC(NH_2)(CH_3)CN}) which is the methylated homologue of AAC and,
 in contrast to the latter, a chiral molecule. 2-APN has been searched for towards Sagittarius B2(N) but no detection has been 
reported\footnote{H. Mollendal, L. Margul\`es, A. Belloche, R.A. Motiyenko, A. Konovalov, K.M. Menten, J.-C. Guillemin, Astron. Astrophys. 2012, 538, A51}. 
Hydrolysis of 2-APN yields $\alpha$-alanine which preserves the chirality of the central carbon atom. 
We used the DELICIOUS 3 spectrometer installed as a permanent end station on the DESIRS beamline at the Synchrotron SOLEIL facility 
in France, in order to record phoionization mass spectra and slow photoelectron spectra of the racemic mixture in the gas phase 
(between its IE and 15.5 eV). Theoretical calculations have been also performed mainly to analyze dissociative photoionization pathways 
of 2-APN. Astrophysical implications of our study will be discussed.\\
This work was supported by the Programme National de Physique et Chimie du Milieu Interstellaire (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES.


       
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