The CW-CRDS spectra of the 16O/18O isotopologues of ozone between 5930 and 6340 cm-1--Part 3: 16O18O18O and 18O16O18O

Abstract Our systematic investigation of the high sensitivity CW-Cavity Ring Down Spectra of 16 O/ 18 O ozone isotopologues at high vibrational excitation continues with the study of the 16 O 18 O 18 O and 18 O 16 O 18 O species. The first two papers of this series were devoted to the analysis of the same four bands of the 16 O 16 O 18 O and 16 O 18 O 16 O species in the 5930–6340 cm −1 domain. Here, after a brief reminder of relevant experiment and theory, we report the analyses of two bands of 16 O 18 O 18 O, vibrationally assigned as 2ν 2 +5ν 3 and 2ν 1 +2ν 2 +3ν 3 _2 and three bands of 18 O 16 O 18 O, assigned to 2ν 1 +2ν 2 +3ν 3 _1, 5ν 1 +ν 3 and 3ν 1 +ν 2 +3ν 3 .They correspond to the highest vibration excitations observed so far for the 16 O 18 O 18 O and 18 O 16 O 18 O isotopologues. Altogether for the two new bands of 16 O 18 O 18 O, 1214 rovibrational transitions were assigned up to J max =29 and for the three new bands of 18 O 16 O 18 O, 948 rovibrational transitions were assigned up to J max =27. Observed line positions were fitted with root-mean squares deviations ranging from 0.005 to 0.011 cm −1 , using effective Hamiltonian models accounting for dark state perturbations. The derived band centres and rotational constants are in good agreement with new theoretical calculations from the molecular potential function. The corresponding lists of 3365 lines are provided as Supplementary material .