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The Role of Symmetry in the Mass Independent Isotope Effect in Ozone

Greg Michalski, S. K. Bhattacharya and Mark H. Thiemens
Proceedings of the National Academy of Sciences of the United States of America
Vol. 106, No. 14 (Apr. 7, 2009), pp. 5493-5496
Stable URL: http://www.jstor.org/stable/40454817
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Role of Symmetry in the Mass Independent Isotope Effect in Ozone
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Abstract

Understanding the internal distribution of "anomalous" isotope enrichments has important implications for validating theoretical postulates on the origin of these enrichments in molecules such as ozone and for understanding the transfer of these enrichments to other compounds in the atmosphere via mass transfer. Here, we present an approach, using the reaction $NO_2^ - + O_3 $, for assessing the internal distribution of the Δ¹⁷O anomaly and the Δ¹⁷O enrichment in ozone produced by electric discharge. The Δ¹⁷O results strongly support the symmetry mechanism for generating mass independent fractionations, and the δ¹⁸O results are consistent with published data. Positional Δ¹⁷O and δ¹⁸O enrichments in ozone can now be more effectively used in photochemical models that use mass balance oxygen atom transfer mechanisms to infer atmospheric oxidation chemistry.

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