SELF-EXCHANGE REACTIONS OF RADICAL-ANIONS IN N-HEXANE

The formation and reactions of radical anions in n-hexane at 190 K wer e investigated by pulse radiolysis and time-resolved fluorescence-dete cted magnetic resonance (FDMR). Electron attachment was found to occur for compounds with gas-phase electron affinities (EA) more positive t han - 1.1 +/- 0.1 eV. The FDMR concentration and time dependence are i nterpreted as evidence for self-exchange electron-transfer reactions, indicating that formation of dimer radical anions is not prevalent for the range of molecules studied. FDMR detection of radical anions is m ainly restricted to electron accepters with EA less than approximately 0.5 eV.