Ab initio study of vibronic coupling in the ozone radical cation

► The diabatic PES of the ozone cation have been calculated ab initio. ► A variational method has been used to calculate vibronic levels of ozone cation. ► Calculated energies have been used to assign PFI-ZEKE spectrum of ozone cation. ► New assignments have been proposed for the spectrum of the ozone cation.