FIGURE 4.

Decay of the substrate radical as a function of time at different temperatures from 197 to 214 K, and overlaid best-fit biexponential functions. The EPR experimental conditions are as described in the legend to Fig. 3. The overlaid solid curves correspond to simulations of the decay with a biexponential function (197–210 K) or monoexponential function (214 K). The simulation parameters are presented in Table 1.