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On the electron-induced isotope fractionation in low temperature 32O2/36O2 ices—ozone as a case study

Sivaraman, B; Mebel, A. M.; Mason, N. J.; Babikov, D. and Kaiser, Ralf (2011). On the electron-induced isotope fractionation in low temperature 32O2/36O2 ices—ozone as a case study. Physical Chemistry Chemical Physics, 13(2) pp. 421–427.

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The formation of six ozone isotopomers and isotopologues, 16O16O16O, 18O18O18O, 16O16O18O, 18O18O16O, 16O18O16O, and 18O16O18O, has been studied in electron-irradiated solid oxygen 16O2 and 18O2 (1 : 1) ices at 11 K. Significant isotope effects were found to exist which involved enrichment of 18O-bearing ozone molecules. The heavy 18O18O18O species is formed with a factor of about six higher than the corresponding 16O16O16O isotopologue. Likewise, the heavy 18O18O16O species is formed with abundances of a factor of three higher than the lighter 16O16O18O counterpart. No isotope effect was observed in the production of 16O18O16O versus 18O16O18O. Such studies on the formation of distinct ozone isotopomers and isotopologues involving non-thermal, non-equilibrium chemistry by irradiation of oxygen ices with high energy electrons, as present in the magnetosphere of the giant planets Jupiter and Saturn, may suggest that similar mechanisms may contribute to the 18O enrichment on the icy satellites of Jupiter and Saturn such as Ganymede, Rhea, and Dione. In such a Solar System environment, energetic particles from the magnetospheres of the giant planets may induce non-equilibrium reactions of suprathermal and/or electronically excited atoms under conditions, which are quite distinct from isotopic enrichments found in classical, thermal gas phase reactions.

Item Type: Journal Item
Copyright Holders: 2011 the Owner Societies
ISSN: 1463-9084
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetNational Aeronautics Space Administration (NASA Astrobiology Institute under Cooperative Agreement no. NNA09DA77A issued through the Office of Space Science
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 33046
Depositing User: Astrid Peterkin
Date Deposited: 06 Mar 2012 11:22
Last Modified: 08 Dec 2018 03:31
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