Spin relaxation parameters in recombining radical ion pair (diphenylsulfide-d(10))(+)/(p-terphenyl-d(14))(-) obtained by OD ESR and quantum beats techniques

Parameters of paramagnetic relaxation were determined by OD ESR and quantum bears techniques for a recombining pair of radical ions (DPS-d(10))(+)/(PTP-d(14))(-) in n-hexane, isooctane, cis-decalin, and squalane solutions. The T-2 relaxation time determined by quantum beats technique is independent of solvent viscosity and magnetic field strength in the range 170-9600 G. These data are in agreement with the results obtained by OD ESR technique assuming fast T-1 relaxation for radical cation. Neglecting the contribution of radical anion relaxation, we obtained T-1c=T(2c)congruent to 50 ns for (DPS-d(10))(+).