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The effect of the isotopic composition of oxygen on the non-mass-dependent isotopic fractionation in the formation of ozone by discharge of O_2

Yang, Jongmann and Epstein, Samuel (1987) The effect of the isotopic composition of oxygen on the non-mass-dependent isotopic fractionation in the formation of ozone by discharge of O_2. Geochimica et Cosmochimica Acta, 51 (7). pp. 2011-2017. ISSN 0016-7037. https://resolver.caltech.edu/CaltechAUTHORS:20130828-110615118

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Abstract

The oxygen gases in a fused silica container cooled to 77K at pressures of 0.5 to 15 cm Hg were energized by an RF generator of 60 kHz to produce ozone which condensed on the cold wall. The isotopomeric compositions of the initial O_2, the O_2 remaining after the discharge, and the O_2 which was completely converted from the O_3 were measured. Oxygen gases of three different isotopic compositions were used. In addition, oxygen pressure, degree of ozone formation, and geometry of the discharge were varied. The isotopomeric data of O_2 gases after the discharge reactions showed very unusual patterns. These patterns depend mainly on the isotopic composition of the oxygen used for the reaction. We compared the data with a model based on the effect of the anharmonicity and the symmetry of the excited ozone molecules on their predissociation. The anharmonicity and symmetry effects depend on the isotopic composition of the O_2 which in turn control the isotope fractionation associated with the formation of ozone. Our data are not compatible with several models such as self-shielding and the structural symmetry of the initial oxygen gas.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0016-7037(87)90189-XDOIArticle
http://www.sciencedirect.com/science/article/pii/001670378790189XPublisherArticle
Additional Information:© 1987 Pergamon Journals Ltd. Received February 4, 1986; accepted in revised form April 24, 1987. We thank V. Nenow for technical help with our equipment. J. Ruth and J. Doris provided other technical assistance. Reviews by M. H. Thiemens. G. W. King. and an anonymous reviewer helped put the paper in better shape. This research was supported by NASA (NGL-05-002- 190). We wish to acknowledge some financial support by Korea Science and Engineering Foundation to one of us (J. Yang) for providing funds which assisted us to complete this work.
Funders:
Funding AgencyGrant Number
NASANGL-05-002-190
Korea Science and Engineering Foundation (KOSEF)UNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences4308
Issue or Number:7
Record Number:CaltechAUTHORS:20130828-110615118
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130828-110615118
Official Citation:Jongmann Yang, Samuel Epstein, The effect of the isotopic composition of oxygen on the non-mass-dependent isotopic fractionation in the formation of ozone by discharge of O2, Geochimica et Cosmochimica Acta, Volume 51, Issue 7, July 1987, Pages 2011-2017, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(87)90189-X.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40976
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Sep 2013 20:24
Last Modified:03 Oct 2019 05:44

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