Pressure-broadened linewidths of ozone

Abstract

Self-broadened and foreign-gas (N2 and O2) broadened linewidths of O3 at 300 °K for a wide range of quantum numbers J and Ka, for both type A and type B bands, have been calculated using the Anderson–Tsao–Curnutte theory of line broadening. In the case of O3–O3 collisions, dipole–dipole, dipole–quadrupole, quadrupole–dipole, and quadrupole–quadrupole interactions have been included. For O3–N2 and O3–O2 collisions, dipole–quadrupole and quadrupole–quadrupole interactions were taken into account. Good agreement was obtained between the available measured linewidths and the computed values for corresonding transitions on using the molecular quadrupole moments of O3 given by Rothenberg and Schaefer. Air-broadened linewidths of O3 at 200 °K have also been computed, so that the temperature dependence can be established.