HIGH RESOLUTION INFRARED SPECTRA OF THE $^{18}O^{16}O^{18}O(C_{2}\nu$) OZONE MOLECULE (1200 TO $500 cm^{-1}$. LINE POSITIONS

Author Institution: Groupe de Spectrom\'etrie Mol\'eculaire et Atmosph\'erique, UMR CNRS 6089 Universit\'e de Reims - Moulin de la Housse - BP 1039After the previous systematic analysis of $^{16}O{_{3}}^{1}, {^{18}}O{_{3}}{^{2}},{^{16}}O^{18}O^{16}O{^{3,4}}$ in medium infrared, we present here the results of the analysis of new $^{18}O^{16}O^{18}O$ observed bands. The spectra have been recorded with the FTS of $Reims^{5,6}$, with a resolution of $0.006cm^{-1}$, and products pathlength $\times$ pressure up to $32 m \times 3$ Torr. The data reduction to derive line positions uses a new multifit $program^{7}$. The analysis of spectra is performed using the same formalism as in references [1-4], using standard Watson's Hamiltonian for diagonal blocks and Coriolis and Fermi resonances for off diagonal blocks. 8 polyads have been analysed, among them 7 being analysed for the first time. They correspond to 10 observed bands (underlined) in interaction with ``dark'' bands. $\begin{array}{l}(\nu_{1}, \nu_{3}); (\nu_{2}+\nu_{3}, \nu_{1}+\nu_{2}); (\nu_{2}+2\nu_{3},\nu_{1}+\nu_{2}+\nu_{3}, 2\nu_{1}+\nu_{2}); (3\nu_{3}, \nu_{1}+2\nu_{3},2\nu_{1}+\nu_{3}); \\ (\nu_{2}+3\nu_{3}); (\nu_{1}+3\nu_{3}, 4\nu_{3}); (\nu_{1}+\nu_{2}+3\nu_{3},\nu_{2}+4\nu_{3}) and (5\nu_{3})\end{array}$ We give here the range of J and $K_{a}$ for observed transitions, statistics for energy levels, spectroscopic parameters and resonance coupling parameters. Acknowledgments: Authors thank S.A Tashkun for use of GIP programs, X. Thomas and P. Von der Heyden for recording spectra, L. R\'{e}galia and J. J. Plateaux for the use of multifit program. 1. S. M. Mikhailenko, A. Barbe, VI. G. Tyuterev and A. Chichery, Atmos. Oceanic Opt., 12, 9 (1999) 2. A. Chichery, A. Barbe, VI. G. Tyuterev, J. Molecular Spectrosc., 206, 1 - 26 (2001) 3. A. Chichery, A. Brabe, VI. G. Tyuterev, S.A. Tashkun, J. Molecular Spectrosc., 205, 347-349 (2001) 4. M. R. De Backer Barilly, A. Barbe, VI. G. Tyuterev, A. Chichery, Mol. Phys., accepted (2002). 5. J.J. Plateaux, A. Barbe, and A. Delahaigue, Spectrochim. Acta, A 51, 1153-1196 (1995). 6. L. R\'{e}galia, Thesis Universit\'{e} de Reims, (France) (1996). 7. J.J. Plateaux, L. R\'{e}galia, C. Boussin and A. Barbe, J.Q.S.R.T., 68, 507-520 (2001)