SELF-BROADENING AND LINESTRENGTH IN THE NU(2) AND NU(5) BANDS OF CH3F

The self-broadening coefficients and the linestrengths of 30 lines in the nu(2) and nu(5) fundamental bands of CH3F have been measured at hi gh resolution in the range 1417-1553 cm(-1), using a tunable diode-las er spectrometer. The lineshape parameters were obtained by fitting non correlated Galatry and Rautian profiles to the measured shapes of the lines. Both models show good agreement between the self-broadening coe fficients derived from the spectra at ''low'' pressure (0.4 to 3 mbar) and those recorded at ''high'' pressure (6 to 18 mbar), but feature a n overestimation of the dynamical friction parameter. A semiclassical calculation of the self-broadening coefficients, performed by using th e main electrostatic interactions only, has provided larger results th an the experimental data. (C) 1996 Academic Press, Inc.