Figure 5. Transient EPR data.

(a) TREPR kinetics for the formation and decay of the ⁵(T₁T₁) and (T₁+T₁) states for NC at 105 K in butyronitrile measured at the indicated magnetic field values corresponding to the species-associated spectra of the ⁵(T₁T₁) and separated T₁ states shown in the inset. Black lines superimposed on the kinetic traces are the fits to the data using the model described in Fig. 3. (b) Echo-detected transient nutation spectra of NC collected at 5 K in butyronitrile following photoexcitation at 640 nm with a 7 ns, 3 mJ laser pulse. The frequency axis was normalized to the nutation frequency of an S=½, BDPA, radical standard collected under the same experimental conditions.