Abstract
In AgCl and AgBr at low temperature an elastic light scattering process is discovered below the indirect exciton absorption edges. Considering the energy-, polarization- and time-dependence, we attribute this process to resonance fluorescence of electronic excitations of small non-metallic Ag-clusters embedded in the crystals. The strong reduction in cw intensity and decay time near and above the exciton edge is interpreted to be due to resonant energy transfer between the electronic states of the clusters and both intrinsic and impurity bound exciton states. The importance of the method to study small concentrations of metal clusters with high sensitivity is pointed out.
Published Version
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