Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1303h&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, June 1985, p. 1303-1306. Research supported by the Camille and Henry
Physics
12
Carbon Dioxide, Chemical Fractionation, Gas Dissociation, Isotope Effect, Meteorites, Oxygen Isotopes, Electric Discharges, Electrolysis, Ozone
Scientific paper
A non-mass dependent (NoMaD) oxygen isotope effect is demonstrated in the dissociation of CO2 similar to that observed in the electrosynthesis of ozone. The molecular oxygen produced carries the signature of two separate isotopic fractionation processes; a mass-dependent fractionation probably due to CO2 + O isotopic exchange, and a secondary NoMaD fractionation (delta O-17 = 0.97 + or - 0.09 delta O-18, with the O2 depleted in O-17 and O-18). It is suggested that the effect is due to either the formation or relaxation of ozone in an excited electronic state. This represents the latest advance in the understanding of chemical NoMaD effects which may be essential to the explanation of non-mass-dependent fractionations observed in meteorites.
Heidenreich John E. III
Thiemens Mark H.
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