Isotope effect in the gas-phase photolysis of cyclohexanone

An isotope effect was found for the carbonyl and -carbon atom in the gasphase photolysis of cyclohexanone, which is apparently magnetic in nature. This finding additionally indicates that the chemically induced dynamic nuclear polarization in the gas phase in the photolysis of cyclohexanone arises predominantly in biradicals and not in triplet molecules. The separation of isotopes occurs more efficiently in the photolysis of aqueous solutions of cyclohexanone than in the gas phase.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2364–2365, October, 1989.