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Anomalous isotope effects in the O(1D) + CO2 isotope exchange reaction

Yeung, Laurence Y. and Eiler, John M. and Okumura, Mitchio (2006) Anomalous isotope effects in the O(1D) + CO2 isotope exchange reaction. Abstracts of Papers of the American Chemical Society, 232 . Art. No. PHYS 368. ISSN 0065-7727.

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The stable isotope compn. of atm. CO_2 can be used to constrain the relative strengths of carbon sources and sinks, and trace the evolution of large-scale atm. transport. In the stratosphere, CO_2 shows an unusual, puzzling enrichment in ^(17)O relative to ^(18)O which is strongly correlated with enrichments in multiply-substituted isotopologues of mass 47 (mainly ^(13)C^(18)O^(16)O). We report evidence of an anomalous enrichment in the multiply-substituted CO_2 isotopologues arising directly from O(1D) + CO_2 isotope exchange reaction. This reaction proceeds through the CO_3* intermediate and these observations may provide information on the dynamics and mechanism of the exchange process. The implications of this for the electronic structure of CO_3*, symmetry-based anomalous isotope effects, and stratosphere-troposphere transport are discussed.

Item Type:Article
Okumura, Mitchio0000-0001-6874-1137
Additional Information:© 2006 American Chemical Society.
Record Number:CaltechAUTHORS:20130722-160215649
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39506
Deposited By: Tony Diaz
Deposited On:22 Jul 2013 23:10
Last Modified:03 Oct 2019 05:07

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