Photochemical Decomposition of Sodium Bromate

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Abstract
The ultraviolet-induced photolysis of powdered NaBrO3 has been studied using both unirradiated crystals and materials subjected to 60Co gamma-ray irradiation. The rate against time curves for all samples show an initial deceleratory stage followed by a final constant rate stage. This final stage deviates from a second-order dependence on light intensity which is in a manner opposite to that reported in most previous studies. The different curvature is attributed to a photolytic generation of additional sites. Gamma-ray irradiation increases the variation from an exact second-order dependence, decreases the initial rate, and decreases the time required to reach the final stage. Irradiation also produces color centers and a shift in the apparent absorption edge. A phenomenological theory has been developed which is consistent with the observed dependence on intensity.

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