Flash photolysis of the nitrate ion in aqueous solution: excitation at 200 nm
- 1 January 1970
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1982-1986
- https://doi.org/10.1039/j19700001982
Abstract
The flash photolysis of aqueous solutions of the nitrate ion at 200 nm has been studied. Spectroscopic observations show that no solvated electrons are produced but that three transient absorption spectra appear with maxima at 3 – [graphic omitted] (NO3 –)* [graphic omitted] NO2+ OH + OH– The recombination of NO2 and OH in the solvent cage gives peroxynitrous acid; this then dissociates, to give the anion. A pK value of 6·0, has been determined for peroxynitrous acid and, assuming that the rate of disappearance of peroxynitrite is controlled by the reaction, ON·O·OH → NO3 –+ H+ the rate constatn of this reaction at room temperature is 1·5 ± 0·2 s–1. The origin of molecular oxygen as a product is examined.Keywords
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