Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..829s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Dec. 1985, p. 829-832. NASA-supported research.
Physics
11
Absorption Cross Sections, Atmospheric Composition, Oxygen, Photodissociation, Ultraviolet Absorption, Chemiluminescence, Mesosphere, Monochromators, Spectrometers, Stratosphere
Scientific paper
Frederick and Cicerone (1985) have proposed that photodissociation of O2 (a 1 Delta g) by the process O2 (a 1 Delta g) + h-nu + O2 (C 3 Delta u) to O(3 P) + O(3 P) may be a major source of odd oxygen in the upper stratosphere and mesosphere. They argued that, since the process is forbidden only by change in the spin multiplicity, it might have been a cross section intermediate between a fully allowed and a strictly forbidden transition, i.e., 10 to the -20th to 10 to the -19th sq cm near 250 nm. In order to test this proposal, absorption by O2 (a 1 Delta g) has been measured in the 190-290 nm wavelength region. No absorption above the detection limit could be observed for O2 (a 1 Delta g) concentrations of (4-7) x 10 to the 15th/cu cm. An upper limit of 8 x 10 to the -22 sq cm was calculated for the cross section.
Leu Ming-Taun
Simonaitis Romualdas
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