ROTATIONAL SPECTRA OF (CH3F)-C-13 IN THE NU(2)=1 AND NU(5)=1 VIBRATIONAL-STATES

Millimeter-wave and submillimeter-wave spectra of the rotational transitions in the nu(2) = 1 and nu(5) = 1 vibrational states of (CH3F)-C-13 were measured up to 462 GHz. Far-infrared spectra of these transitions were measured in the region 30-65 cm(-1) with a resolution of 0.0019 cm(-1) using an interferometric spectrometer Bruker IFS 120 HR. Almost 700 lines including 14 lines of the Delta(k - l(5)) = +/-3 perturbation-allowed transitions in the nu(5) = 1 state were assigned. Both vibrational states are strongly perturbed, especially by the x,y-Coriolis resonance and ''2, -1'' l-type interactions. The corresponding spectroscopical parameters were determined by a nonlinear least-squares fit to the experimental data. (C) 1994 Academic Press, Inc.