Analysis of the CRDS spectrum of 18O3 between 6950 and 7125 cm-1

E. Starikova , A. Barbe , Marie-Renée de Backer , Vl. G. Tyuterev , D. Mondelain (1) , S. Kassi (1) , A. Campargue (1)

1 LAME-LIPhy - LAsers, Molécules et Environnement

The absorption spectrum of the 18O3 isotopologue of ozone was recorded by CW-Cavity Ring Down Spectroscopy in the 6950-7125 cm-1 region. The typical noise equivalent absorption of the recordings is αmin ≈1×10-10 cm-1. The spectrum is dominated by three very weak bands: 3ν1+5ν3 near 7009 cm-1 and the ν2+7ν3 and 4ν2+5ν3 interacting bands near 7100 cm-1. In total 260, 206 and 133 transitions were assigned for the 3ν1+5ν3, ν2+7ν3 and 4ν2+5ν3 bands, respectively. The line positions of the 3ν1+5ν3 band were modelled using an effective Hamiltonian (EH) model involving two dark states - (6 0 1) and (2 5 2) - in interaction with the (3 0 5) bright state. The EH model developed for the ν2+7ν3 and 4ν2+5ν3 bands involves only the (0 1 7) and (0 4 5) interacting bright states. Line positions could be reproduced with rms deviations on the order of 0.01 cm-1 and the dipole transition moment parameters were determined for the three observed bands. The obtained set of parameters and the experimentally determined energy levels were used to generate a list of 984 transitions of the three bands which is provided as Supplementary Material.

Domaines: Optique [physics.optics]

E. Starikova, A. Barbe, Marie-Renée de Backer, Vl. G. Tyuterev, D. Mondelain, et al.. Analysis of the CRDS spectrum of 18O3 between 6950 and 7125 cm-1. Journal of Quantitative Spectroscopy and Radiative Transfer, 2012, 113, pp.1741-1752. ⟨10.1016/J.JQSRT.2012.04.023⟩. ⟨hal-00997601⟩