HIGH-RESOLUTION INFRARED-SPECTRUM OF THE C-F STRETCHING MODE OF (CH2FCL)-CL-37

Diode laser spectra of (CH2FCl)-Cl-37 (95% isotopically pure sample) h ave been recorded in the 9.4 mu m region characterized by tile nu(4) f undamental. The spectral analysis allowed the assignment of more than 3700 transitions with J less than or equal to 92 and K-a less than or equal to 16 of the expected a/b-hybrid structure. The nu(4) fundamenta l, whose origin is at 1067.7140 cm(-1), mainly interacts through a- an d b-type Coriolis coupling with the nu(9) fundamental located at lower wavenumbers near 1002 cm(-1). Local effects arising from Fermi resona nce with nu(5) + nu(6) have been observed for the K-a' = 14 level. An effective set of upper state molecular constants was determined by fit ting tile less perturbed transitions to the Watson's A-reduction Hamil tonian in the I'representation. Due to the second-order a-type Corioli s resonance, a number of perturbation-allowed transitions of nu(9) wer e observed and assigned near the avoided crossing. Using a suitable pr ogram, we experienced a two band system analysis which produced the mo lecular constants of the nu(4) = 1 and nu(9) = 1 states along with the interaction parameter. From spectral simulation of nu(4), the \Delta mu(a)/Delta mu(b)\ dipole moment ratio was estimated to be 1.8 + 0.2. (C) 1997 Academic Press.