CRDS spectroscopy of 18O3. Part 2: Analysis of six interacting bands between 5930 and 6080 cm−1

The absorption spectrum of 18O3 has been recorded in the 5930-6080 cm−1 region using CW-Cavity Ring Down Spectroscopy. 1888 transitions belonging to five bands have been assigned. Three of them are A-type bands: 2ν2 + 5ν3, ν1 + ν2 + 5ν3 and 5ν1 + ν3, and two bands are of B-type: 2ν1 + ν2 + 4ν3 and 4ν1 + 3ν2. Despite a complex spectral pattern perturbed by many rovibrational resonances, it has been possible to find a suitable effective Hamiltonian model reproducing all the transition wavenumbers (corresponding to 1016 energy levels) with an rms deviation of 9.5 × 10−3 cm−1. A set of 721 line intensities was determined and fitted to derive the effective transition moment parameters. This set of parameters and the experimental energy levels were used to generate a complete line list of 2795 transitions allowing to generate synthetic spectrum in good agreement with the experimental spectrum.