The quest for ozone intensities in the 9-11 μm region: A retrospective

We review efforts to experimentally determine absolute line intensities for ozone transitions in the 9-11 μm spectral region over the last several decades. Much of this work has been driven by the requirements for remote sensing of terrestrial atmospheric ozone. While significant progress has been achieved, discrepancies persist among various infrared measurements, and the relation between infrared and ultraviolet standards is not clearly resolved.

► The past three decades of ozone absolute IR line intensity studies are reviewed. ► Despite significant progress, discrepancies persist at the 4% level, on average. ► Larger discrepancies between measurements exist for some individual lines.