Ionic mechanisms for heterogeneous stratospheric reactions and ultraviolet photoabsorption cross sections for NO2(+), HNO3, and NO3(-) in sulfuric acid

Details Ionic mechanisms for heterogeneous stratospheric reactions and ultraviolet photoabsorption cross sections for NO2(+), HNO3, and NO3(-) in sulfuric acid Ionic mechanisms for heterogeneous stratospheric reactions and ultraviolet photoabsorption cross sections for NO2(+), HNO3, and NO3(-) in sulfuric acid

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1359b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 13, July 6, 1992, p. 1359-1362.

Physics

13

Atmospheric Chemistry, Nitrogen Oxides, Reaction Kinetics, Stratosphere, Sulfuric Acid, Ultraviolet Absorption, Aerosols, Free Radicals, Nitrates, Nitric Acid, Nitronium Compounds, Photoabsorption

Scientific paper

Room temperature photo-absorption cross sections between 180 and 340 nm for potassium nitrate dissolved in sulfuric acid-water solutions of 0, 80, and 96 percent sulfuric acid by mass are presented. The predominant nitrogen-containing species are the nitrate anion (NO3(-)) in pure water or dilute sulfuric acid solutions, molecular nitric acid (HNO3) in 80 percent sulfuric acid, and the nitronium ion (NO2(+)) in 96 percent sulfuric acid. Upon reviewing the literature involving these species, elementary ionic and molecular reactions in mechanisms of stratospheric heterogeneous catalysis are considered. A general mechanism is formulated for acid catalyzed reactions, with examples that convert inactive HCl and ClNO3 into photochemically active ClNO2, ClNO, Cl2, HOCl, and ClO, and it is shown that reactions forming all of these products are thermodynamically allowed.

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