Absorption Bands of Tl+ Centers Doped in Ionic Crystals with the CsCl Structure
Absorption Bands of Tl+ Centers Doped in Ionic Crystals with the CsCl Structure
复制标题
CsCl结构离子晶体中Tl中心掺杂的吸收带
DOI：
10.1143/jpsj.71.2566
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发表时间：
2002
影响因子：
1.7
通讯作者：
S. Hashimoto
中科院分区：
文献类型：
--
作者：
T. Kawai;S. Hashimoto
研究了氯化铯结构的卤化铵和卤化铯晶体中Tl+心的吸收光谱，其吸收范围可达真空紫外区。在NH4X：Tl+(X=Cl，Br)晶体中，由于Tl+离子的离子内跃迁，在基质晶体基频吸收带边以下的能区观察到了A、B和C吸收带。另一方面，在CSX：Tl+(X=Cl，Br，I)晶体中，在吸收带边的下方出现了几个吸收带，它们的吸收强度没有太大的差别。最低的吸收带被指定为A吸收带，其他吸收带不具有B和C带的特征。NH4X：Tl+和CSX：Tl+晶体的吸收带外观明显不同，尽管被8个最近邻卤素离子包围的Tl+离子周围的离子排列相同。讨论了NH4X：Tl+和CSX：Tl+晶体的吸收带差异。
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 ca...