Abstract
We have investigated the absorption spectra of Tl + centers doped in ammonium and cesium halides crystals with the CsCl structure up to the vacuum ultraviolet energy range. In the NH 4 X:Tl + (X = Cl, Br) crystals, the A, B and C absorption bands due to the intraionic transitions in the Tl + ion are observed in the energy region below the fundamental absorption band edge of the host crystals. In the CsX:Tl + (X = Cl, Br, I) crystals, on the other hands, several absorption bands having no extremely different absorption intensity appear below the absorption band edge. The lowest absorption bands are assigned to the A absorption band, and other absorption bands have no feature of the B and C bands. The appearance of the absorption bands is remarkably different between the NH 4 X:Tl + and CsX:Tl + crystals, in spite of the same ion arrangements around the Tl + ion which is surrounded by eight nearest-neighbor halogen ions. The difference of the absorption bands between the NH 4 X:Tl + and CsX:Tl + crystals can be interpreted by that of the next nearest-neighbor cation around the Tl + ion.
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