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Upper limit on the rate constant for isotope exchange between molecular oxygen and ozone at 298K
Author(s) -
Anderson S. M.,
Morton J.,
Mauersberger K.
Publication year - 1987
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl014i012p01258
Subject(s) - ozone , oxygen , reaction rate constant , kinetic isotope effect , homogeneous , isotope , reaction rate , chemistry , thermodynamics , environmental chemistry , catalysis , kinetics , physics , atomic physics , deuterium , nuclear physics , organic chemistry , quantum mechanics
The gas phase bimolecular isotope exchange reaction between molecular oxygen and ozone has been investigated directly for the first time. Its rate coefficient is found to be less than 2 × 10 −25 cm³‐sec −1 at 298 K, over six orders of magnitude below recent estimates. Much faster exchange was observed over condensed ozone at 77K, suggesting isotopic scrambling is catalyzed under these conditions. The low rate coefficient implies that homogeneous exchange between ground state oxygen and ozone molecules cannot play a significant role in heavy ozone chemistry.