Fourier transform and high sensitivity cw-cavity ringdown absorption spectroscopies of ozone in the 6030–6130 cmK1 region. First observation and analysis of the 3n1C3n3 and 2n2C5n3 bands

The absorption spectrum of 16O3 has been recorded between 6030 and 6130 cmK1 by Fourier Transform Spectroscopy (GSMA, Reims) and cw-cavity ringdown spectroscopy (LSP, Grenoble). The two new bands 3n1C3n3 and 2n2C5n3 centered at 6063.923 and 6124.304 cmK1, respectively are observed and analyzed. Rovibrational transitions with J and Ka values up to 40 and 10, respectively, could be assigned. The rovibrational fitting of the observed energy levels shows that some rotational levels of the (303) and (025) bright states are perturbed by interaction with the (232), (510) and (124) dark states. The observed energy levels could be reproduced with a rms deviation of 5!10K3 cmK1 using a global analysis based on an effective Hamiltonian including the five interacting states. The energy values of the three dark vibrational states provided by the fit are found in good agreement with theoretical predictions. The parameters of the resulting effective Hamiltonian and of the transition moment operator retrieved from the measured absolute line intensities allowed calculating a complete line list of 2035 transitions, available as Supplementary Material. The integrated band strengths are estimated to be 1.22!10K24 and 3.15!10K24 cmK1/(mol cmK2) at 296 K for the 3n1C3n3 and 2n2C5n3 bands, respectively. A realistic error for these band strengths is 15% (see text). q 2005 Elsevier B.V. All rights reserved.