Abstract
Photoproduced N,N,N′,N′-tetramethylbenzidine cation radicals in sodium dodecyl sulfate micelles decay in a pseudo-first-order reaction with an apparent rate constant k(t) depending on time according to k(t)=Btα−1 , where B and α(0<α≤1) are constants. At a given temperature the numerical value of B decreases with the storage time between preparation of the micellar solution and photoionization achieving a constant value for a storage time of a few days. The numerical value of α is essentially independent of the storage time and determines the distribution of cation radical lifetimes for a given value of B.
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