Optical properties of the(1) center in KCl
- 1 May 1983
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 27 (9), 5332-5346
- https://doi.org/10.1103/physrevb.27.5332
Abstract
We report both experimental and theoretical studies of the (1) center in KCl, a center consisting of a neutral Tl atom perturbed by the field of an adjacent anion vacancy. Absorption bands peaking at 1040, 720, 550, and 340 nm are all shown to belong to the (1) center. The relatively weak () bands at 1040 and 720 nm correspond to absorptions terminating on the crystal-field-split components of the level, while the stronger band at 550 nm corresponds to transition to a state derived largely from . The sole luminescence band is the laser-active band having 1.6-μsec decay time and peaking at 1520 nm. The model presented here can account for the transition energies of the manifold, including the Stokes shift between absorption (at 1040 nm) and luminescence, as well as the polarization properties and relative oscillator strengths of the 1040-, 720-, and 550-nm bands.
Keywords
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