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Odd oxygen formation in the laser irradiation of O2 at 248 nm - Evidence for reactions of O2 in the Herzberg states with ground state O2Two O3 formation processes (initiation and autocatalytic) are studied in pure O2 and in O2+N2 and O2+Ar mixtures at pressures between 200 and 1600 torr and at temperatures between 298 and 370 K. Evidence is presented that the initiation process produces O3 through chemical reactions between ground state O2 and excited O2 in the Herzberg states, which are produced by the photoabsorption of O2 at 248 nm. For the autocatalytic process, the results are consistent with the proposal that the O3 formation is accelerated by photodissociating vibrationally excited O2(nu), produced in the photolysis of O3 following its initial formation. It is argued that the O2 Herzberg states and O2(nu) may play important roles in the odd oxygen chemistry in the middle atmosphere. It is estimated that the O2(A3Sigma-u(+))+O2 reaction may yield up to about 6 percent of the total odd oxygen production rate near 50 km.
Document ID
19920072023
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shi, Jichun
(NASA Headquarters Washington, DC United States)
Barker, John R.
(Michigan, University Ann Arbor, United States)
Date Acquired
August 15, 2013
Publication Date
August 20, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D12,
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
92A54647
Distribution Limits
Public
Copyright
Other

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