OD ESR signals of excess electrons in liquid hydrocarbons depending on the geminate recombination parameters, theory and experiment

Abstract The intensity of optically detected ESR (OD ESR) signals from radical-ion pairs in solution under ionizing irradiation has been investigated experimentally and theoretically as a function of the microwave power, the geminate recombination parameters, the diffusion coefficient, the distance distribution function of pairs, and the spin-lattice relaxation time. In line with theoritical predictions, the temperature dependence of an OD ESR signal has been shown to have a maximum depending on the microwave power. The experimental dependence has been measured for the system e − + triethylamine + (TEA) in 3-methylpentane. Agreement between the theoretical and experimental dependences is discussed.