The primary reaction in the photolysis of nitric acid vapor by ultraviolet radiation is " 0 3 + hv -HO + NOz and the primary quantum yield is 1. This article gives experimental evidence in favor of these two conclusions for the wavelengths 200, 255, 290, and 300 nm. The photolysis of nitric acid vapor in laboratory apparatus is subject to several unwanted side reactions, and conditions must be carefully selected to eliminate the effect of such reactions.
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