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13C polarization in the solid state as a function of time with 15 mM radical concentration. The increasing curve shows the polarization build-up with microwaves on (93.952 GHz, 100-mW source output). The decreasing curve shows the polarization decay after shutting off the microwaves. Mono-exponential fittings of the data yield a polarization build-up time constant of 4,900 s and a relaxation time of 28,200 s.
