Abstract
The electron spin echo (ESE) technique is applied to determine the spin relaxation times of long-lived lightinduced radicals and short-term spin-correlated radical pairs (SCRPs) formed by the laser flash of a composite consisting of [6,6]-phenyl-С61-butyric acid methyl ether (PCBM) and poly-(3-hexylthiophene) (P3HT) at 80 K. The ESE signal dependences recorded to measure the longitudinal relaxation times of P3HT + /PCBM – SCRPs and the free P3HT + radical are fitted by the exp(–(t/T1) 0.6 ) dependence with Т1 values lying in the microsecond time scale. The difference in the transverse spin relaxation times of the P3HT + /PCBM – radical paira appeared after selective and non-selective echo-detected EPR spectrum excitation is explained by the instantaneous diffusion model. Based on the model, the magnetic interaction energy between the electron spins in P3HT + /PCBM – SCRPs is estimated; E/ћ ∼ 10 6 s –1 .
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