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Science 4 March 1983:
Vol. 219. no. 4588, pp. 1073 - 1075
DOI: 10.1126/science.219.4588.1073
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Articles

The Mass-Independent Fractionation of Oxygen: A Novel Isotope Effect and Its Possible Cosmochemical Implications

MARK H. THIEMENS 1 and JOHN E. HEIDENREICH III 1

1 Department of Chemistry, University of California, San Diego, La Jolla 92093

Experimental evidence is presented which demonstrates a chemically produced, mass-independent isotopic fractionation of oxygen. The effect is thought to result from self-shielding by the major isotopic species 16O2, but other possible mechanisms such as molecular symmetry cannot be ruled out. In a three-isotope plot, the experimentally produced fractionation line is essentially equal in slope to the observed carbonaceous chondrite mixing line. The implications for the early history of the solar system are discussed.

Submitted on September 24, 1982
Revised on December 17, 1982


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