IR Detection of Free Radicals and Monitoring Their Reactions

5 IR DETECTION OF FREE RADICALS AND MONITORING THEIR REACTIONS 

There are many cases when radical absorption in the UV region overlaps with a tail of absorption of a photoinitiator or other species produced by photolysis. Optical detection may become less sensitive or impossible. Also, a transient radical may have low absorption (extinction coefficient) in the UV-vis region. For example, a 

Radicals of TPO (Fig. 12.16) participate in self- and cross-termination and second-order kinetics fit is probably a random case. 

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