Centers in Additively Colored KCl:NaCl Crystals
- 15 January 1969
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 177 (3), 1324-1328
- https://doi.org/10.1103/physrev.177.1324
Abstract
Two centers have been investigated which, like the center, are produced by optical conversion from centers in sodium-doped KCl crystals. They each have one absorption band on the long-wavelength side of the band, and they each contain one center. One of these, the center, absorbs at around 636 nm and luminesces at 1240 nm, while the other, the center, absorbs at approximately 620 nm and luminesces at around 1310 nm. Like the and centers, the and centers are each able to trap a second electron, forming a qualitatively similar primed center, and they each have a single ionized form which lacks visible and near-infrared transitions. The dependences of the and center on sodium concentration further indicate that the center contains two ions and the center three. From the details of their anisotropic behavior, it is likely that the center lies between the two ions in the center and lies in the same (100) plane with the three ions in the center.
Keywords
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