A flasch photolysis–resonance fluorescence study of the formation of O(1<i>D</i>) in the photolysis of water and the reaction of O(1<i>D</i>) with H2, Ar, and He −

Abstract

The relative importance of two primary processes in the photolysis of water, H2O+hν → H+OH d in Processes I and II, respectively. The initially formed O(1D) was deactivated to ground state O(3P) prior to detection via resonance fluorescence. The relative quantum yields for Porcesses I and II are 0.89 and 0.11 for the wavelength interval 105–145 nm and ?0.99 and ?0.01 for the wavelength interval 145–185 nm. Rate constants at 300 °K have been determined relative to that for Reaction (1), O(1D)+O2 → O(3P)+O2 decrease in O signal as a function of H2, Ar, or He pressure for the following reactions: O(1D)+H2 → H+OH % (2), O(1D)+Ar → O(3P)+Ar e−1⋅s−1, we obtain the following results: %k2 = (2.5±1.5) ×10−10, k3 = (8±4) ×10−13, and k4 &amp;lt; 5×10−14 cm3 molecule−1⋅s−1.