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%%\title{EXPERIMENTAL VALUES OF THE ROTATIONAL AND VIBRATIONAL CONSTANTS AND EQUILIBRIUM STRUCTURE OF DEUTERATED SILYL FLUORIDE SiD3F}

\title{A NEW TREATMENT OF THE 2$\nu_{3}$ (A$_{1}$) INFRARED BAND OF METHYL BROMIDE CH$_{3}$Br AROUND 1213 cm$^{-1}$}
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\author{\underline{\FirstName HAMID \LastName NAJIB}}
\address{Laboratoire des Energies Renouvelables et Environnement, D\'epartement de Physique, Facult\'e des Sciences, Universit\'e Ibn Tofa\"il, BP: 133, K\'enitra, MOROCCO}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
 28 Aug - 1 Sep, 2023}}}
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The high-resolution Fourier transform infrared spectrum of methyl bromide CH$_{3}$Br  has been reinvestigated in the v$_{3}$ = 2 vibrational excited state around 1213 cm$^{-1}$, for both $^{79}$Br and $^{81}$Br isotopologues. \\
Thanks to new accurate K-dependent and J-dependent ground state parameters, up to sextic centrifugal distortion constants, 420 new infrared transitions of the 2$\nu_{3}$ band have been assigned for CH$_{3}$$^{79}$Br and CH$_{3}$$^{81}$Br, extending the rotational quantum number values up to K$_{max}$ = 15 and J$_{max}$ = 60. For each isotopic species, a standard deviation of 2 x 10$^{-4}$ cm$^{-1}$ has been obtained for about 700 lines of 2$\nu_{3}$. The new parameter values of the v$_{3}$ = 2 excited state are in good agreement with ones determined previously by infrared spectroscopy, but significantly more accurate.

 

\footnotetext[1]{Hamid Najib \emph{J. Mol. Spectrosc.}, \textbf{370}, (2020)111297.}

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