Detection and analysis of new bands of 16O 3 by CRDS between 6500 and 7300 cm -1
Résumé
The absorption spectrum of the 16O 3 isotopologue of ozone has been recorded in the 7000-7920 cm -1 region by high sensitivity CW-Cavity Ring Down Spectroscopy. This report is devoted to the analyses of the 7065-7300 cm -1 region dominated by the ν1 + 2 ν2 + 5 ν3 and ν1 + 5 ν2 + 3 ν3 A-type bands at 7130.8 and 7286.8 cm -1 respectively. 289 transitions were assigned to the ν1 + 2 ν2 + 5 ν3 band. The corresponding line positions were modeled with an effective Hamiltonian involving Coriolis resonance interactions between the (1 2 5) upper state and the (4 4 0), (0 2 6) and (6 1 0) dark states, and an anharmonic resonance interaction with the (2 0 5) state. The very strong interaction (up to 50% mixing of the wavefunctions) between the (1 2 5) and (6 1 0) states leads to the observation of two extra lines of the 6 ν1 + ν2 band due to a resonance intensity transfer. 213 transitions of the ν1 + 5 ν2 + 3 ν3 band were assigned and modeled taking into account a Coriolis resonance interaction with the (3 6 0) state. We take the opportunity of the present work to report the analysis of the very weak 4 ν2 + 4 ν3 B-type band at 6506.1 cm -1 which was assigned from previously recorded CRDS spectra. 286 transitions were modeled using the effective Hamiltonian approach. The dipole transition moment parameters of the three analyzed bands were determined by a least-squares fit to the measured line intensities. For the three studied band systems, the effective Hamiltonian and transition moment operator parameters were used to generate line lists provided as Supplementary Materials.