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\title{HIGH RESOLUTION SPECTROSCOPY OF RELATIVELY LARGE RADICAL SPECIES IN THE SUB-MILLIMETER WAVE RANGE USING ZEEMAN AND FARADAY ROTATION ACQUISITIONS. FIRSTS RESULTS ON VINOXY, ACETYL, AND ACETONYL RADICALS.}

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\author{\underline{\FirstName R. \LastName CHAHBAZIAN},         \underline{\FirstName L. \LastName JUPPET}
  \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}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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Molecular radicals are key species for chemical reactions occurring in combustion processes as well as in atmospherical and astrophysical environments\footnote{Hirota, Eizi, \textit{Springer {Series} in {Chemical} {Physics}}, \textbf{40} (1985)}. However, the characterization of ``large'' radicals (defined here as containing more than 5 atoms) using high-resolution gas phase absorption spectroscopic techniques remains tedious and requires the development of specific experimental setups to increase the sensitivity of the spectrometers. To this end, we associated a frequency multiplication chain spectrometer, allowing high-resolution spectral acquisition in the 75-900 GHz range, with a relatively specific technique of radical synthesis based on  H abstraction on a given precursor by reaction with F atoms in a flow cell\footnote{G. Inoue and H. Akimoto, \textit{J. Chem. Phys.} \textbf{74} 425 (1981)}$^,$\footnote{O. Chitarra, O. Pirali, J.-T. Spaniol, T. S. Hearne, J.-C. Loison, J. F. Stanton, and M.-A. Martin-Drumel, \textit{The Journal of Physical Chemistry A}, \textbf{126} 7502 (2022)}. Since paramagnetic species (e.g., radicals) are sensitive to the magnetic field, an alternative magnetic field was generated in the cell allowing the use of Zeeman Modulation\footnote{M.Elhanine, R.Farrenq and G.Guelachvili, \textit{Mikrochimica Acta}, \textbf{95} 265 (1988)} (ZM) as well as Faraday Rotation Modulation\footnote{G. Litfin, C.-R. Pollock, R.-F. Curl and F.-K. Tittel, \textit{The Journal of Chemical Physics}, \textbf{72} 6602 (1980)} (FRM) techniques to record broadband and ``radical-only'' spectra.
Using these techniques, the spectra of the vinoxy radical (CH$_2$CHO), the acetyl radical (CH$_3$CO), and the acetonyl radical (CH$_3$COCH$_2$) have been recorded. I will present these instrumental developments as well as the associated preliminary spectroscopic results.



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