High-resolution FTIR study of thiocarbonyl difluoride SCF2 -: Analysis of the ν2, ν3, ν5, and ν6 bands

High-resolution (similar to 3 x 10(-3) cm(-1)) FTIR spectra of the planar SCF2 molecule have been recorded in the range of the four lowest-lying fundamentals nu(2) (789.535 cm(-1)), nu(3) (526.697 cn(-1)), nu(5) (419.546 cm(-1)), and v(6) (623.187 cm(-1)). For each band 4500-7500 transitions have been assigned and fitted to a standard Watson-type Hamiltonian up to quartic terms, sigma(Fit) similar to 3.5 x 10(-4) cm(-1). No indication of rovibrational perturbations was found, excited state rotational and centrifugal distortion constants being close to their ground state values. Ground state parameters previously determined from microwave spectra were, in part, improved by a merge of the appropriately weighted microwave data and similar to 10 000 ground state combination differences that were obtained from the nu(4) band and spanning J and K-a values of 88 and 49, respectively. (C) 1998 Academic Press.