title: Isotopic exchange between carbon dioxide and ozone via O(1D) in the stratosphere.
abstract: We propose a novel mechanism for isotopic exchange between CO2 and O3 via O(1D) + CO2 --> CO3* followed by CO3* --> CO2 + O(3P).  A one-dimensional model calculation shows that this mechanism can account for the enrichment in 18O in the stratospheric CO2 observed by Gamo et al. [1989], using the heavy O3 profile observed by Mauersberger [1981].  The implications of this mechanism for other stratospheric species and as a source of isotopically heavy CO2 in the troposphere are briefly discussed.
authors.affiliation: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91125, USA.
authors.forename: Y L
authors.initials: YL
authors.lastname: Yung
authors.forename: W B
authors.initials: WB
authors.lastname: DeMore
authors.forename: J P
authors.initials: JP
authors.lastname: Pinto
mesh_terms: D001272:Atmosphere; D002245:Carbon Dioxide / Q000737:chemistry*; D018534:Earth, Planet; D008956:Models, Chemical; D010103:Oxygen Isotopes; D010126:Ozone / Q000737:chemistry*; D010777:Photochemistry; D010782:Photolysis
chemical_list: D010103:Oxygen Isotopes; D002245:Carbon Dioxide; D010126:Ozone