Relative quantum yield of Q(1D2) following ozone photolysis between 221 and 243.5 nm

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Abstract
Relative values of the quantum yield, Φ*(λ), of O(1D2) from the photolysis of ozone in the wavelength region 221–243.5 nm have been measured by observing the weak 630‐nm fluorescence from the spin forbidden O(1D2) → O(3P) transition. The relative quantum yield was determined at 243.5, 235, 231, 228.5, and 221.5 nm, with the value of Φ*(221.5 nm) equal to 0.87 ± 0.04 agreeing with a recent O(3P) resonance fluorescence measurement made at 222 nm. Additionally, the results point to a significantly lower quantum yield at short wavelengths than that currently recommended for stratospheric models. The results of this experiment, when placed in context with previous studies, confirm a trend toward a decreasing quantum yield at shorter wavelengths observed in earlier work.