THE NU-4-BAND OF CARBONYL FLUORIDE

Using 0.0025-cm-1 resolution Fourier transform laboratory spectra, a thorough analysis of the ν4 band of COF2 has been performed leading to an extensive (up to J = 77 and Ka = 46) and precise (±0.0002 cm-1) set of energy levels for the v4 = 1 vibrational state of this molecule. It proved not possible to reproduce these experimental levels when considering the v4 = 1 vibrational state as isolated, and it has been necessary to take into account the Coriolis-type resonance between the levels of this state and those of a nearby state located about 4 cm-1 below. In this way, an accurate band center (ν0(ν4) = 1243.26609 ± 0.00014 cm-1) and rotational and coupling constants were derived. These constants were then used to generate a comprehensive list of line parameters suitable for high-resolution atmospheric studies. © 1991.