The photolysis was investigated at 313 nm wavelength,253-529 K temperatures, and 4 X 10-"-2 X mol.photon/cm%ec light intensities by determining the quantum yields of 20 reaction products. Primary quantum yields for the seven primary processes and rate constant ratios, rate constants, and Arrhenius parameters for secondary processes were derived on the basis of the suggested reaction scheme. The dependence of the quantum yields of the four major primary processes on experimental conditions was established.
The photolysis of mixtures of nitric acid and nitrogen dioxide has been studied at 2650A and room temperature. A mechanism has been suggested which is in accordance with the experimental results obtained at both low and high overall pressures. The value of 1.0 (f0.05) was obtained for the primary quantum yield of NOz photolysis at 2650A. The rate constant ratio k l / k z of the elementary reactionsOH+HN03 -+H20+N03 was determined, and estimates for the rate constants of steps NO3 +NO2 +NO2+ 0 2 +NO O+HN03 +OH+NO, were made.
The direct photolysis of nitric acid has been studied at 2650 and 2537A at small conversions. According to the experimental results, a hydroxyl radical and a NOz molecule are formed in the primary process. The primary quantum yields are 0.1 and 0.3 at wave lengths 2650 and 2537& respectively. The experiments with added oxygen indicate that the contributions of the excited singlet and triplet states to the decomposition are comparable at 2650 8, ; however, at 2537 A the decomposition originates almost exclusively from the excited singlet state.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.