Temperature-dependent quantum yields for O(P-3) and O(D-1) production from photolysis of O-3 at 248 nm

A pulsed laser photolysis-resonance fluorescence technique was employed independently by two laboratories to measure Phi(O3P), the quantum yield for production of O(P-3) from O-3 photolysis at 248 nm, between 196 and 427 K. The agreement between the two studies is very good, and the combined results are adequately represented by the function Phi(O3P) = (0.115 +/- 0.030) x exp((35 +/- 60)/T) where the uncertainties are 2sigma. Within experimental uncertainties, the new results are in agreement with previously reported room temperature results as well as with the single previous temperature dependence study, and greatly reduce the uncertainties in Phi(O3P)(T) and Phi(O1D)(T) (=1- Phi(O3P)(T)) especially at temperatures other than room temperature. The yield of O(P-3) in the reaction of O(D-1) with O-3 is shown to be greater than unity at room temperature and below, and to increase slightly with decreasing temperature.