Air-broadened Ozone Linewidths in the Submillimeter Wavelengths

The submillimeter frequency coverage of the EOS-MLS aboard the Aura spacecraft has necessitated the measurement of a larger data set of air-broadened ozone linewidths at these wavelengths. An automated submillimeter spectrometer that utilizes directly synthesized radiation, programmable mass-flow controllers and a temperature controlled cell was implemented for expedient data collection of 17 diÆerent rotational transitions in the 620 - 660 GHz range. Many previous ozone rotational line-broadening studies have focused on single transitions, typically in the millimeter wavelengths, with the notable exception of a broadband FT-FIR study that characterized the J,Kc dependencies of many higher quanta states. The current measurements lie in a middle range of the pre- vious measurements and allow a more comprehensive picture of the J,Kc dependencies of linewidths over the entire ozone rotational ban