Line-mixing effects in the rotational ^rQ-branches of ¹⁶O₃ perturbed by N₂ and O₂

Line-mixing effects have been studied in the ^rQ₅ to ^rQ₁₂ rotational subbranches of ¹⁶O₃. Far-infrared Fourier transform measurements have been made in the 30-90 cm^-1 spectral region for mixtures of ozone with N₂ and O₂ at room temperature and total pressures in the 0.5-1.3 atm range. A careful analysis of the experimental data evidence, for the first time, the effects of line interferences on absorption in the far-infrared ozone branches. Modifications with respect to additive Lorentzian line contributions are on the order of 15% at the ^rQ_Ka peaks under atmospheric conditions. A simple model is proposed in order to account for these line-mixing effects. It successfully predicts the spectral shape in the 0.05-1.3 atm total pressure range for both O₃-O₂ and O₃-N₂ collisions.