Infrared Spectrum of Gaseous Carbonyl Fluoride-18O

From the infrared spectra of gaseous carbonyl fluoride-18O(F122C18O) the six fundamental vibrational frequencies (in cm−1) are: (a1) 1895.2 (average of Fermi resonance doublet), 947.3, 576.5; (b1) 1242.3, 604.9; (b2) 770.0. These unambiguous assignments are consistent with the less certain assignments for this isotopic species that Mallinson, McKean, Holloway and Oxton, Spectrochim. Acta 31A, 143 (1975) derived from an argon-matrix spectrum of 4% F122 C18O in a mixture of four isotopomers