Nonexponential quenching kinetics

The usual subject of experimental study with time-resolved methods is the nonexponential quenching kinetics, which is system response to 8-pulse... 

Persistent microheterogeneity exists when the luminescence and quenching decay are fast compared to conformational-environmental rearrangement. Excited molecules can then emit and be quenched in distinctly different chemical environments. Decays can then be nonexponential, multiple emissions may be present, and simple Stern-Volmer kinetics can break down. 

Initially this decay proceeds as usual e /Texp(—ck t), but then becomes essentially nonexponential and noncontact. Setting ct = 0 and using (3.44) in Eq. (3.45), one obtains for the final stage the famous Forster kinetics of dipole-dipole quenching [11,69] ... 

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