The High-Resolution Infrared Spectrum of the ν1/2ν2Fermi Dyad Bands of COF2

High-resolution FTIR data of carbonyl fluoride in the region of the C–O stretch ν1fundamental have been analyzed. Satisfactory interpretation of the spectral data required a rigorous analysis that involved the inclusion of Fermi resonance with the 2ν2state and Coriolis interaction with the 2ν3+ ν6dark state. Deperturbed molecular constants for the three interacting states as well as perturbation parameters that fit the data within the limits of the experimental accuracy of ∼0.00035 cm−1have been obtained. Interesting evidence of “axis interchange” in the 2ν2state has been observed.