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

Our systematic investigation of the high sensitivity CW-Cavity Ring Down Spectra of O-16/O-18 ozone isotopologues at high vibrational excitation continues with the study of the (OOO)-O-16-O-18-O-18 and (OOO)-O-18-O-16-O-18 species. The first two papers of this series were devoted to the analysis of the same four bands of the (OOO)-O-16-O-16-O-18 and (OOO)-O-16-O-18-O-16 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 (OOO)-O-16-O-18-O-18, vibrationally assigned as 2 nu(2)+5 nu(3) and 2 nu(1)+2 nu(2)+3 nu(3)_2 and three bands of (OOO)-O-18-O-16-O-18, assigned to 2 nu(1)+2 nu(2)+3 nu(3)_1, 5 nu(1)+nu(3) and 3 nu(1)+nu(2)+3 nu(3). They correspond to the highest vibration excitations observed so far for the (OOO)-O-16-O-18-O-18 and (OOO)-O-18-O-16-O-18 isotopologues. Altogether for the two new bands of (OOO)-O-16-O-18-O-18, 1214 rovibrational transitions were assigned up to J(max)=29 and for the three new bands of (OOO)-O-18-O-16-O-18, 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. (C) 2013 Elsevier Ltd. All rights reserved.