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Abstract
Using a modified reverse micelle protocol with acetyl bromide as the bromide source, AgBr nanocrystals can be grown over a size range from 30 Å radius to bulk. These clusters exhibit quantum confinement indicated by an increasing blue shift of the free exciton emission peak as a function of size. As the cluster size decreases, a concomitant decrease occurs in the apparent radiative lifetime. This is predicted as the k selection rules break down at small crystal diameters. However, the effects are quite modest. indicating that even at these smallest sizes, the indirect character of the transition is largely retained.