%The 28th Colloquium on High Resolution
%Molecular Spectroscopy
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\title{LINE-BY-LINE INTENSITY MEASUREMENTS OF METHYL FLUORIDE IN THE $\nu_2$ and $\nu_5$ BANDS}



\author{\underline{\FirstName H. \LastName ZIADI},
	\underline{\FirstName O. \LastName BEN FATHALLAH}, 
	\underline{\FirstName I. \LastName BEN CHOUIKHA}}
\address{Laboratory of Spectroscopy and Molecular Dynamics, National Superior School of Engineering of Tunis, 5 Av Taha Hussein, 1008 Tunis, Tunisia}

\author{\underline{\FirstName F. \LastName KWABIA TCHANA},
	\underline{\FirstName X. \LastName LANDSHEERE}}
\address{Universit\'e Paris Cit\'e and Univ Paris Est Creteil, CNRS, LISA, F-75013 Paris, France }

\author{and \underline{\FirstName H. \LastName AROUI}}
\address{Laboratory of Spectroscopy and Molecular Dynamics, National Superior School of Engineering of Tunis, 5 Av Taha Hussein, 1008
	Tunis, Tunisia}
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
			Aug. 28 - Sept. 1, 2023}}}
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\category {3,9}
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	\index{CH$_3$F}


Systematic measurements of line intensities in the $\nu_2$ and $\nu_5$ bands of CH$_3$F were performed for the first time for 2040 transitions using a mono-spectrum fitting technique utilizing Voigt and Rautian profiles. The spectra are recorded at room temperature for eight pressures of CH$_3$F from $0.1247$ to $2.5080$ Torr using the Bruker IFS125HR Fourier Transform spectrometer located at the LISA facility in Cr\'eteil. Strong intensity perturbations were observed and analyzed, accounting for the strong Coriolis coupling $\nu_2$ and $\nu_5$ bands and l-type interactions in the $\nu_5$ band. The transition dipole moments squared were determined for each line, allowing determination of the vibrational transition moment and the Herman-Wallis coefficients of each band using the Aliev\footnote{MR. Aliev, D. Papousek and S. Urban, \textit{J. Mol. Spectrosc}, \textbf{124}, 285-325, (1987)} and W\textit{at}son\footnote{JKG. W\textit{at}son, \textit{J. Mol. Spectrosc}, \textbf{153}, 211-224, (1992)} models. Comparison with data available in the literature permits testing the validity of these models applied to the $\nu_2$/$\nu_5$ dyad system, strongly affected by resonances.
	
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