THE MILLIMETER-WAVE ROTATIONAL SPECTRUM AND CORIOLIS INTERACTION IN THE 2 LOWEST EXCITED VIBRATIONAL-STATES OF CHCLF2

The millimeter-wave rotational spectrum of (CHClF2)-Cl-35 (Freon CFC-2 2) in the two lowest excited vibrational states,nu(9) and nu(6), was m easured up to 470 GHz and assigned to J = 80. The data set consists of over 850 transitions for the two states and is reduced in two ways. F or easy reproduction of the spectrum effective A- and S-reduction Wats onian sextic-level constants for each state are derived from fitting t he data limited to J '' less than or equal to 50. The most satisfactor y data reduction is, however, obtained by taking into account the Cori olis interaction between the two vibrational states; a simultaneous fi t of all the data results in an accurate value for the interstate sepa ration and in Coriolis coefficients, zeta(6,9)((a)) and zeta(6,9)((c)) , and vibration-rotation constants, alpha, which are in good agreement with values from ab initio calculations. (C) 1995 Academic Press, Inc .