Detection and analysis of four new bands in CRDS 16O3 spectra between 7300 and 7600 cm−1

Abstract

The absorption spectrum of the 16O3 isotopologue of ozone was recorded in the 7000–7920cm−1 region by using high sensitivity CW-Cavity Ring Down Spectroscopy (αmin∼10−10cm−1). This report is devoted to the analysis of the 7300–7600cm−1 region dominated by four A-type bands: 6ν1+ν3 centred around 7395cm−1, 3ν1+5ν2+ν3 and 2ν1+4ν2+3ν3 lying in the 7450cm−1 region and 5ν1+2ν2+ν3 centred around 7579cm−1. 213 transitions of the 6ν1+ν3 band were assigned and the corresponding line positions were modeled using an effective Hamiltonian including a Coriolis resonance interaction between the (601) upper state and a A-type dark state. The two very close 3ν1+5ν2+ν3 and 2ν1+4ν2+3ν3 bands were analysed using a similar effective Hamiltonian scheme involving the anharmonic resonance coupling between the (351) and (243) states. For these two bands, 304 transitions were assigned. The modelling also includes a first Coriolis resonance interaction between the (351) bright state and the (530) dark state, and a second one between the (243) bright state and the (144) dark state. In the 7579cm−1 region, 205 transitions of the 5ν1+2ν2+ν3 band were assigned and modelled taking into account the Coriolis resonance interactions between the (521) upper state and the (700), (342) and (280) dark states.The dipole transition moment parameters of the four analysed bands were determined by a least-squares fit to the measured line intensities. For the studied band systems, the effective Hamiltonian and transition moment operator parameters were used to generate line lists provided as Supplementary Materials.