Abstract
The absolute strengths of 93 lines belonging to the ν2and ν5bands of methyl fluoride were measured in the range of 1416–1503 cm−1using a tunable diode-laser (TDL) spectrometer. These experimental line intensities were obtained from the equivalent width method. The intensities were analyzed within a dyad system, required to account properly for the strong Coriolis coupling between ν2and ν5. The fit to the experimental data led to the determination of the dipole moment derivatives ∂μ/∂q2and ∂μ/∂q5, as well as the first-order Herman-Wallis correction in K to ∂μ/∂q5. The intensities were reproduced with an overall standard deviation of 1.44%, to be compared with a mean experimental uncertainty equal to 1.58%. The values derived for the vibrational band strengths of ν2and ν5are 2.124 (18) cm−2·atm−1and 36.96 cm−2·atm−1at 296 K, respectively.
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