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\title{THE NEWLY SET-UP SPECTROSCOPIC MOLECULAR BEAM APPARATUS: \\ PRODUCING TRANSIENT MOLECULES IN A COLD SUPERSONIC JET}

\author{\underline{\FirstName S. \LastName SCHWETJE}, \underline{\FirstName J. \LastName JAKOB}, \underline{\FirstName V. \LastName GRIGORIAN}, \FirstName M. A. \LastName KAUFMANN, \FirstName A. A. \LastName BREIER, \FirstName  G. W. \LastName FUCHS and \FirstName T. F. \LastName GIESEN}
\address{Laborastrophysik, Universit{\"a}t Kassel, Heinrich-Plett-Stra{\ss}e 40, 34132 Kassel, Germany}


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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\category {5,8}
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\index{REMPI}
\index{Even-Lavie valve}
\index{Supersonic expansion}
\index{Discharge}
\index{Astrochemistry}
\index{Mass-selective}


Diffuse interstellar bands, or DIBs, are features in absorption spectra of astronomical objects. Probable carriers of those bands are various, yet unassigned molecules found in the visible and near-infrared sprectra of interstellar gas and dust clouds. Complex organic molecules may contribute to the DIBs as shown in recent work by Campbell \textit{et al.} when they assigned some of the near-infrared DIBs to the molecular ion C$_{60}^+$.\footnote{\href{https://doi.org/10.1038/nature14566}{doi:10.1038/nature14566}, E. Campbell, M. Holz, D. Gerlich et al., ``Laboratory confirmation of C$_{60}^+$ as the carrier of two diffuse interstellar bands'', Nature \textbf{523}, 322-323 (2015).}
To assign more DIBs, laboratory experiments are required. Therefore, it is necessary to employ a powerful source which is capable of producing astrochemically relevant molecules coupled with high resolution spectroscopy.

The Even-Lavie high-pressure pulsed valve provides a supersonic jet with cooling properties below 1 K, backing pressures up to 100 bars, repetition rates up to 600 Hz and gas pulse widths of 20 microseconds.\footnote{\href{https://doi.org/10.1063/1.481405}{doi:10.1063/1.481405}, U. Even, J. Jortner, D. Noy, N. Lavie, C. Cossart-Magos, ``Cooling of large molecules below 1 K and He clusters formation'', J. Chem. Phys. 8 May 2000; 112 (18): 8068-8071.} Together with a mountable AC discharge source it is capable of producing both stable and transient molecules in a jet to approach the production of astrochemically relevant species.

Here we present preliminary data from a molecular beam setup coupled with a discharge source and REMPI spectroscopy as the detection technique.

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