Abstract
Ar-broadening coefficients are measured for 29 lines of CH3F in theRQ0andRQ6branches of the ν6band, using a tunable diode–laser spectrometer. The collisional widths obtained by fitting Rautian profiles to the measured shapes of the lines are significantly larger, especially for the overlapping lines at low-J values, than those obtained from Voigt profiles. The broadening coefficients for the lines belonging to the same low-J transitions (J = 7–10) appear to be greater in theRQ0branch than in theRQ6branch. Comparisons have been made with calculated results based on a semiclassical model including adjustable potential parameters.
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