Knowledge Bank

High resolution spectra of $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O3$ in the 5 $\mu m$ have never been recorded up to now. To derive intensities and positions of the lines of isotopic ozone a set of sepctra have been obtained with the new F. T. S. built in Reims [1]. The spectra of 98% $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O3$ introduced in the absorption cell of 31.2 cm long, at different pressures (9.4 Torrs, 6 Torrs, 4 Torrs) have been performed in one hour, with a signal to noise ratio of 800, at resolution of $0.003cm-1$ corresponding to a 3 m path difference, using stepping mode. The observed experimental results are derived from least squares fits on line shape. The accuracy is 7 $10-1$ $cm-1$ for wavenumbers and 4% for absolute intensities. For the analysis we used Watson’s type hamiltonian [2] with 22 constants for each vibrational state (200, 101 and 002) and 9 coupling constants for Coriolis and Darling-Dennisson resonances betwen these states. Finally, we give all the set parameters, a portion of listing with assignments observed and calculated wavenumbers and intensities, as well as standard deviation for $\nu$ and S.