The v1+v3 Bands of the 16O17O16O and 16O16O17O Isotopomers of Ozone

Abstract

Using 0.002 cm−1 resolution Fourier transform absorption spectra of an 17O enriched ozone sample, an extensive analysis of the v1+v3 bands of the 16O17O16O and 16O16O17O isotopomers of ozone has been performed for the first time. The experimental rotational levels of the (101) vibrational states were satisfactorily reproduced using a Hamiltonian matrix that takes into account the observed rovibrational resonances. More precisely, for 16O17O16O, as for the other C2v-type ozone isotopomers, it was necessary to account for the Coriolis type resonances linking the (101) rotational levels with the levels of the (200) and (002) vibrational states and the Darling–Dennison interaction coupling the levels of (200) with those of (002). For the Cs-type isotopomer, namely 16O16O17O, as for 16O16O18O and 16O18O18O, it proved necessary to also account for an additional ΔKa=±2 resonance involving the rotational levels from (101) and (002) (J.-M. Flaud and R. Bacis, Spectrochimica Acta Part A54, 3–16 (1998)). Using a Hamiltonian matrix which takes these resonances explicitly into account, precise vibrational energies and rotational and coupling constants were deduced, leading to the following band centers: v0(v1+v3)=2078.3496 cm−1 for 16O17O16O and v0(v1+v3)=2098.8631 cm−1 for 16O16O17O.