Abstract
New absorption bands in KCl and KBr crystals are observed in near infra red region. It is considered that they arise from F' type centers which consist of R 1 , R 2 or M center and one more electron. F' type bands appear during the process of F→F' conversion in the crystal containing complex centers, and they are located at 1.60 µ, 1.72 µ, 2.15 µ and 1.49 µ, 1.60µ, 1.94µ in KBr and KCl crystals, respectively. F' type centers are thermally unstable than F' center. These centers are called R 1 ', R 2 ' and M'.
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