Analyses of FT spectra of C2V ozone isotopologues in the 4500-5700 cm−1 region: 16O18O16O, 18O16O18O and 18O3

- Analyses of FT spectra of C2V ozone isotopologues in the 4500-5700 cm−1 region.
- Bands of 16O18O16O, 18O16O18O and 18O3 have been ro-vibrationally assigned.
- Effective Hamiltonian model taking account of resonance coupling and dark states.
- Comparison of derived band centres and rotational constants with new theoretical calculations.

This work continues the systematic investigation of high resolution infrared spectra of 18O enriched ozone isotopologues in the 4500-6300 cm−1 spectral range. So far, the 16O18O16O and 18O16O18O spectra have been recorded and analysed using Fourier Transform Spectrometer (FTS) below 5000 cm−1 and using high sensitivity Cavity Ring-Down Spectroscopy above 6000 cm−1. In order to fill the gap between 5000 and 6000 cm−1, new infrared spectra were recorded with the Reims FTS. The analyses of the 2ν1+ν2+3ν3 band of 16O18O16O and of the 5ν3, ν1+2ν2+3ν3 and ν1+5ν3 bands of 18O16O18O are reported. New ν1+2ν2+3ν3 and ν1+5ν3 bands of 18O3 were also observed and analysed. Observed line positions were fitted using effective Hamiltonian models accounting for the dark state perturbations. The derived band centres and rotational constants are in a good agreement with new theoretical calculations from the molecular potential function.