Dependence of the EPR spectrum of the 2H4-aminoethanol generated CoII-substrate radical pair state in EAL on time at T=207 K after temperature-step reaction initiation. The free electron resonance position at g=2.0 is shown by the arrow. Experimental Conditions: microwave frequency, 9.3434 GHz; microwave power, 20.25 mW; magnetic field modulation, 1.0 mT; modulation frequency, 100 kHz; scan rate: 6.52 mT/s; time constant, 2.56 ms.