First line intensities of the ν 3 + ν 6 band of methyl fluoride
Résumé
Infrared spectra of CH 3 F were recorded in the 2200 cm -1 region using a Fourier transform spectrometer in Reims, France, with a resolution of 0.003 cm -1 . The measurements were conducted using a White-type cell with a path length of 8.26 m at different pressure of CH 3 F between 1 and 15 mbar. This spectral region corresponds to the ν 3 + ν 6 band, which is measured for the first time in this work. Experimental line positions and intensities were determined using the Voigt lineshape as a model in mono-spectrum fitting. The band assignment was carried out up to J = 45 and K = 15 using our home-made Spec-traMatcher computer code, resulting in more than 1800 measured lines. Strong intensity perturbations were observed, explained by a strong Coriolis coupling for 2ν 3 and ν 3 + ν 6 bands. The square of the transition dipole moments was determined for each line, resulting in the determination of the vibrational transition moment and the Herman-Wallis coefficients of each band using the Watson model.
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