Abstract
The high-resolution (0.0030 cm −1) Fourier transform infrared spectrum of CH 2 79BrF has been studied in part of the atmospheric window between 910 and 980 cm −1, the region of the ν 9 (935.847 cm −1) and ν 5 + ν 6 (961.239 cm −1) bands. The ν 9 fundamental consists of a pseudo a-type band induced by Coriolis coupling with ν 5 + ν 6, in turn exhibiting a predominant a-type structure. Several interactions connecting these levels and the dark state 3 ν 6 have been assessed. The whole data set is treated using Watson’s A-reduced Hamiltonian in the I r representation implemented with first order a- and b- and c-type Coriolis terms. A detailed analysis of the rotational structure yields a set of accurate upper-state parameters up to quartic distortion terms for ν 9 and ν 5 + ν 6. In addition, spectroscopic information about the dark ternary overtone of ν 6 has been obtained.
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