Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..769m&link_type=abstract
Geophysical Research Letters, vol. 7, Oct. 1980, p. 769-772.
Physics
11
Atmospheric Chemistry, Free Radicals, Nitrates, Photochemical Reactions, Photodissociation, Cross Sections, Dye Lasers, Oxygen Atoms, Photolysis, Pulsed Lasers, Resonance Fluorescence
Scientific paper
The nitrate free radical is photolyzed by a pulsed tunable dye laser between 470 and 685 nm, at 296 K, and in the presence of 10 torr N2. The two product channels, NO + O2 and NO2 + O, are measured by resonance fluorescence of NO or of O, using laser flash photolysis of NO2 (which yields NO and O) to achieve absolute system calibration. The photolysis coefficients for the two product channels at the earth's surface with an overhead sun in the wavelength region of 470-700 nm show that NO2 + O are the major photolysis products. This indicates that photolysis of NO3 by visible light generates a neutral cycle with respect to the formation or the destruction of ozone. Relative to former values, the photolysis rate coefficient values predict a 0.5 percent increase in total ozone, and a maximum of 2 percent more in local tropospheric regions, while a 20 percent decrease of N2O5 during the day is also predicted as a result from the higher total NO3 photolysis rate.
Johnston H. S.
Magnotta F.
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