During the last two years, we have investigated the high energy levels of the 16O3 molecule 1 , and references herein, approaching the dissociation limit (_ 8000 cm_1 ) from high sensitivity CW-CRDS spectra recorded in Grenoble. The spectra of the totally substituted 18O3 isotopologue have been also recorded in the same 6000 _ 7000 cm_1 spectral range in order to provide complementary information on the Potential Energy and the Dipole Moment Surfaces. Up today, 14 bands (10 A-type bands and 4

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... type bands) have been observed and analyzed. We present here the results of the analyses for each band : range of observed quantum numbers, parameters of the effective Hamiltonian and effective transition moment, as well as several comparisons between observed and calculated spectra. The comparison between the vibrational energies predicted from the potential function and the observed band centers will be discussed for the the 18O3 isotopologue and the 16O3 molecule.