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 Title: TWO EQUIVALENT INTERNAL ROTATIONS OBSERVED IN THE MICROWAVE SPECTRUM OF 2,6-DIMETHYLFLUOROBENZENE Author(s): Nguyen, Ha Vinh Lam Contributor(s): Khemissi, Safa Subject(s): Mini-symposium: Large Amplitude Motions Abstract: The microwave spectrum of 2,6-dimethylfluorobenzene, one of the six isomers in the dimethylfluorobenzene family, was measured using a pulsed molecular jet Fourier transform microwave spectrometer in the frequency range from 2 to 40 GHz. Quantum chemical calculations were performed at the B3LYP/6-311++G(d,p) and MP2/6-31G(d,p) levels of theory to obtain optimized molecular geometries. The latter level yielded values of the rotational constants which were in almost exact agreement with the experimental values, and had eased tremendously the spectral assignment. Due to the internal rotation of the two equivalent methyl groups, all rotational transitions split into quartets with separations of up to several hundreds of MHz. The splittings were analyzed and modeled using the \textit{XIAM}\footnote{H. Hartwig, H. Dreizler, \textit{Z. Naturforsch.} \textbf{51a}, 923, (1996).} and the \textit{ntop} code\footnote{L. Ferres, W. Stahl, H.V.L. Nguyen, \textit{J. Chem. Phys.} \textbf{151}, 104310, (2019).} to measurement accuracy. The deduced \textit{V}$_{3}$ potential value of 206.4 cm$^{-1}$ is in reasonable agreement with the values predicted by quantum chemistry. Issue Date: 24-Jun-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/107522 Date Available in IDEALS: 2020-06-26
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