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Evidence for direct molecular oxygen production in CO2 photodissociation

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Science  03 Oct 2014:
Vol. 346, Issue 6205, pp. 61-64
DOI: 10.1126/science.1257156

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Illuminating oxygen out of carbon dioxide

It has long been known that high-energy ultraviolet light can split carbon dioxide into CO and O fragments. Lu et al. have now uncovered a parallel pathway that appears to yield C and O2 instead (see the Perspective by Suits and Parker). By precisely measuring the energy and trajectory of the carbon fragment after CO2 irradiation, O2 formation could be inferred. The results introduce a potential mechanism for abiotic oxygen production in CO2-heavy atmospheres of other planets.

Science, this issue p. 61; see also p.30