The Fourier transform infrared spectrum of CH2--~-CHF has been investigated in the v7 band region around 115 5 cm -1 at a resolution of about 0"002 cm-1. This fundamental of symmetry species A' yields an a/b hybrid band with a prevalent contribution of the a-type component. The band is affected by first-order b-Coriolis resonance with the v9 + v12 combination, and the interactions are markedly stronger for the K'a = 11 and 12 levels; local perturbations with crossings due to higher-order a-and b-Coriolis resonances have also been observed. The rovibrational analysis led to the identification of more than 2900 lines of v7 with J ~< 64 and Ka ~< 18, while no features were detected for the v9 + v12 band. Using Watson's A-reduction Hamiltonian in the I" representation, the present ground state combination differences combined with available microwave data led to improved sextic distortion terms for the ground state. Of the assigned lines, 2329 free of major resonance contribution provided excited state constants for the v 7 band. Furthermore, from the perturbation effects near the crossings, some parameters for the v 9 + v12 combination have been determined.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.