New accurate calculations of ozone line-broadening by O₂ and N₂

Calculations of ozone line-broadening parameters by N₂ and O₂ are presented. A recent model, previously tested with success on H₂O line-widths, is used; unlike previous approaches, it provides a correct treatment of close collisions; trajectory changes in module and directio, as well as dispersive and repulsive contributions to the intermolecular interaction in the short range, are accounted for. Such improvements are of great importance for the modeling of pressure broadening for weakly polar molecular systems. Comparisons between O₃-O₂ and O₃-N₂ experimental and theoretical room-temperature half-widths for B-type bands are presented. It is shown that our model predicts accurately both broadenings and greatly improves theoretical results for oxygen broadening; furthermore, the effects of close collisions are demonstrated.