CW-Cavity Ring Down spectroscopy of 18O3. Part 1: Experiment and analysis of the 6200-6400 cm-1 spectral region

The absorption spectrum of the O-18(3) isotopologue of ozone has been recorded in the 6200-6400 cm(-1) region by high sensitivity CW-Cavity Ring Down Spectroscopy. The spectrum is dominated by the 2v(1) +5v(3) and 2v(1) +3v(2)+3v(3) bands at 6270.6 and 6392.2 cm(-1), respectively which were treated independently. The rovibrational analysis of the 2v(1) +5v(3) band has evidenced that the (205) upper state is perturbed by Coriolis resonance interactions with the (016), (304) and (350) states. A total of 659, 89, 131 and 5 transitions were assigned to the 2v(1) + 5v(3), v(2) + 6v(3), 3v(1) + 4v(3) and 3v(1) + 5v(2) bands, respectively. In the case of the 2v(1)+3v(2)+3v(3) band, 344 transitions were assigned. Some of them were found perturbed by a Coriolis interaction of the (233) state with the (520) state. Overall, 681 energy levels were derived from the analysis of the 2v(1) + 5v(3) and 2v(1) + 3v(2) + 3v(3) band systems. In both cases, a suitable effective Hamiltonian was elaborated, allowing accounting satisfactorily for the retrieved rovibrational energy levels. In addition, dipole transition moment parameters were determined by a least-squares fit to the measured line intensities. The effective Hamiltonian and transition moment operator parameters were used to generate a list of 1619 transitions given as Supplementary material. (C) 2009 Published by Elsevier Inc.