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

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(³P_J) 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(a¹Δ_g). 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.