Optical study of the site symmetry distribution in KBr:Sm2+

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Abstract
The 4.2 °K narrow line fluorescence of KBr:Sm2+ arising from 5D0→7FJ transitions have been investigated in terms of Zeeman anisotropy fluorescence analysis, lifetime measurements, and Zeeman polarization determinations. There is a strong resemblance between the optical properties of the KBr:Sm2+ system and those of the previously investigated KCl:Sm2+ system. As in KCl:Sm2+, the dominant site is the nearest‐neighbor (nn) C2v Sm2+–K+ vacancy pair. A few additional lines attributable to the second nn C4v pair have been found in KBr:Sm2+. The present findings support the earlier conclusion that alkali halide crystals doped with divalent cations are usually characterized by a distribution of the first few nn ion defect pairs.