Time-resolved resonance fluorescence studies of O(1D2) yields in the photodissociation of O3 at 248 and 308 nm

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Abstract
The yield of electronically excited oxygen atoms O(1D2) following excimer laser photolysis of ozone at 248 and 308 nm was directly measured using time‐resolved resonance fluorescence emission at ≊130 nm. The result obtained at 248 nm is in good agreement with a previous resonance fluorescence measurement in which the yield of ground‐state O(3PJ) was determined in the presence of gases which either quenched or reacted with O(1D2). The relative yield determined at 308 nm 0.79±0.02 is the first such determination in the region of weak Hartley band absorption near the thermochemical threshold for production of O(1D2)+O2(a1Δg). When taken in conjunction with the previously measured relative yields of O(1D2) at this wavelength, this result suggests that the yield of electronically excited oxygen atoms at 300 nm is 0.96±0.02.