PHOTOLYSIS OF OZONE AT 308 AND 248 NM - QUANTUM YIELD OF O(D-1) AS A FUNCTION OF TEMPERATURE

The quantum yield of O(D-1), Phi(T), in the 308 nm photolysis of ozone has been shown to decrease very slightly with temperature (T), from 0 .79+/-0.10 at 298 K to 0.73+/-0.10 at 200 K. At 248 nm, Phi is (0.91+/ -0.06) independent of temperature (200-320 K). The rate constant for t he reaction of O(1D) with O-3 was measured to be (2.3+/-0.5)x10(-10) c m(3) molecule(-1) s(-1), independent of temperature (200-350 K). The m easured quantum yields suggest that the current recommendations over-e stimate the effect of temperature on O(D-1) quantum yields in O-3 phot olysis at 308 nm.