Electron paramagnetic resonance study of Eu2+ centers in melt-grown CsBr single crystals
Electron paramagnetic resonance study of Eu2+ centers in melt-grown CsBr single crystals
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DOI：
10.1103/physrevb.85.144119
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发表时间：
2012-04
影响因子：
3.7
通讯作者：
H. Vrielinck;D. Zverev;P. Leblans;J. Tahon;P. Matthys;F. Callens
中科院分区：
文献类型：
--
作者：
H. Vrielinck;D. Zverev;P. Leblans;J. Tahon;P. Matthys;F. Callens
用电子顺磁共振(EPR)研究了CsBr单晶中Eu2+单体中心的结构。这些中心是通过在真空中600K以上加热熔融生长的晶体，然后快速淬火到室温(RT)或77K而产生的。它们的EPR谱的角度依赖关系表明这些中心具有立方对称性。在RT下，Eu2+离子的聚集使EPR谱衰减。这与用物理气相沉积方法合成的CsBrEu针形图像板的情况形成了强烈的对比，在那里观察到Eu2+相关的EPR谱在RT下表现出长期的稳定性。
The structure of Eu 2+ monomer centers in CsBr single crystals is investigated using electron paramagnetic resonance (EPR) spectroscopy. These centers are produced by heating the melt-grown crystals above 600 K in vacuum followed by a rapid quench to room temperature (RT) or 77 K. The angular dependence of their EPR spectrum demonstrates that these centers have cubic symmetry. At RT the EPR spectrum decays by aggregation of the Eu 2+ ions. This strongly contrasts with the situation for CsBr:Eu needle image plates synthesized by physical vapor deposition, where the Eu 2+ -related EPR spectrum was observed to exhibit long-term stability at RT.