Coriolis interaction and anharmonic potential function of ozone from the microwave spectra in the excited vibrational states

Microwave absorption spectra of ozone were identified in the excited vibrational states with v₁ = 1, v₂ = 1 and 2, and v₃ = 1. In the v₁ = 1 and v₃ = 1 states, an anomaly due to a strong Coriolis interaction was observed. The inertia defect in the Coriolis perturbed states was defined and successfully applied to the analysis. The Coriolis coupling constant ζ₁₃^c was determined to be 0.60, from which the quadratic force constants were derived. The cubic potential constants (and third-order force constants) were determined from the vibration-rotation interaction constants obtained. The quartic potential constants were derived from the vibrational anharmonic constants by McCaa and Shaw. Close similarities were observed among the anharmonic potential constants of ozone, sulfur dioxide, and oxygen difluoride. The equilibrium structure and average structures in the ground and excited vibrational states were obtained.