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\title{CONFORMATIONAL LANDSCAPE AND INTERNAL DYNAMIC OF LEVULINIC ACID FROM BROADBAND
 ROTATIONAL SPECTROSCOPY}

\author{\underline{\FirstName E.~M. \LastName NEEMAN}, \FirstName N. \LastName OSSEIRAN,
 \underline{\FirstName T.~R. \LastName HUET}}
\address{Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Mol\'ecules,
 F-59000 Lille, France}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\category {4}
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\index{Microwave}


Lignocellulose is the most abundantly available raw material on the Earth for the production
 of biofuels.
\footnote{C.H. Zhou, X. Xia, C.X. Lin, D.S. Tong, and J. Beltramini, Chem. Soc. Rev., \textbf{40},
 5588--5617 (2011)}
The main challenge is to produce useful chemicals from it. A variety of chemicals and
 biomolecules are produced via the hydrothermal conversion of waste biomass. 
Among the produced products is levulinic acid (LA). This biomolecule is considered to be of the
 top 10 chemical compounds,
\footnote{T. Werpy and G. Petersen, Top Value Added Chemicals from Biomass: Volume I, Results of
 Screening for Potential Candidates from Sugars and Synthesis Gas. United States N. p.(2004)} 
as it has an important potential to be considered as a platform chemical.
\footnote{G.C. Hayes and C.R. Becer, Polymer Chemistry, \textbf{11}, 4068--4077 (2020)} 
It is used in the production of diverse chemical compounds in different area such as 
pharmaceuticals, herbicides, polymers,
fuels etc. Gas phase rotational studies permit a better understanding of intermolecular
 interactions that control 
the conformation landscape of molecules and their internal dynamics. We present herein,
 a broadband rotational study in jet-cooled
conditions, of the relevant levulinic acid in the 6-18 GHz range.
\footnote{This work is part of the sub-project SIMO-LB-HR, supported by the project 
WAVETECH-Hauts-de-France in the frame of the State-Region Plan Contract} 
One conformer has been identified in the gas phase. The spectrum showed clearly that the
 lines were split. This splitting is due to the internal rotation of the methyl group. The A
and E states lines were assigned and fitted, and the experimental barrier of the methyl
 torsion was determined.

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