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A new matrix, 1,1,1-trifluorotrichloroethane, CF 3 CCl 3 , has been employed in radiation chemistry studies to stabilise positive ions. As a test, positive ions of benzene, toluene, orto-, meta- and paraxylene and biphenyl have been generated by y-irradiation of the solutes contained in the CF 3 CCl 3  matrix at 77 K. The ions have been investigated by ESR, and hyperfine couplings have been obtained. The data complement and correct the splitting values obtained previously in the adsorbed state.

ESR of Cation Radicals of Methyl-substituted Benzenes in a CF 3 CCl 3 Matrix