Optical absorption of TI^＋ ions in KBr1-xIx：TlI mixed crystals

Optical absorption spectra of the mixed crystals of KBr1-xIx：Tl^＋ crystals studied at room temperature are reported. The absorption spectra indicated the appearance of additional bands on the low energy side of the Characteristic A, B and C absorption bands of KBr：TI^＋ single crystals with increasing iodine composition. Comparing with earlier reports, the additional bands were attributed to the complex TI^＋ centers in the mixed configuration surrounded by Br^- and I^- ions as nearest neighbors. The absorption spectra of gamma irradiated mixed crystals showed F band, which shifts towards low energy side with the composition of iodine ions in the mixed crystals.