Abstract
Site-selective laser spectroscopy is used to investigate the defect structure of KCl:${\mathrm{Sm}}^{2+}$. A total of nine sites have been identified at 12 K. Our results indicate that the ${C}_{2v}$[110] nearest-neighbor complex dominates the spectrum. All the other sites belong to clusters that can be eliminated by quenching from elevated temperatures. These clusters may represent the nucleation stage for the formation of the Suzuki phase. The overwhelming dominance of the ${C}_{2v}$[110] center is in disagreement with recent theoretical calculations which estimate the stability of the ${C}_{2v}$[110] and the ${C}_{4v}$[200] complexes to be comparable.
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