Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..624t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, June 1987, p. 624-627.
Physics
39
Atmospheric Chemistry, Oxygen Isotopes, Ozone, Photolysis, Stratosphere, Ultraviolet Radiation, Isotopic Enrichment, Pressure Effects, Trace Elements
Scientific paper
Ozone was produced by UV photolysis (157-200 nm) of molecular oxygen. The product ozone is enriched in O-17 and O-18 on a mass-independent basis, similar to the fractionations observed in an electrical discharge. The magnitude of O-18 and O-17 enrichment decreases with decreasing pressure, suggesting the presence of two fractionation mechanisms with differing delta-O-17/delta-O-18 ratios. One of the end members would be mass-independent with delta-O-18 equal to delta-O-17 equal to about 90 percent, which is dominant above about 20 torr. The second process which is significant below about 6 torr produces O3 with delta-O-18 equals about -55 percent, delta-O-17 equals about -27.5, possibly due to isotopic selectivity in diffusion to the reaction systems wall. The delta-O-17 = delta-O-18 isotopic fractionation resembles that observed in stratospheric ozone, though the magnitude of fractionation is a factor of four less.
Jackson Teresa
Thiemens Mark H.
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