Heisenberg spin exchange and chemical electron exchange in napthalene negative ion- an electron spin-lattice relaxation study

Abstract

Electron spin-lattice relaxation times (T_1e) as determined by saturation recovery technique and linewidths have been investigated as a function of the concentration of napthalene anion and the unreduced napthalene in dimethoxyethane from conditions of slow exchange to fast exchange. It was observed that Heisenberg spin exchange was more effective in determining T_1e and linewidth than chemical exchange at comparable concentrations. Contrary to earlier findings, T_1e was found to depend on the radical concentration even at the fast exchange regime.