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Production of isotopically heavy ozone by ultraviolet light photolysis of O2Ozone 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.
Document ID
19870057084
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thiemens, Mark H.
(California Univ. La Jolla, CA, United States)
Jackson, Teresa
(California, University La Jolla, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1987
Publication Information
Publication: Geophysical Research Letters
Volume: 14
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
87A44358
Funding Number(s)
CONTRACT_GRANT: NSF ATM-85-15648
CONTRACT_GRANT: NAG9-83
Distribution Limits
Public
Copyright
Other

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