基于离子簇模型,采用d9离子在四角伸长八面体对称中电子顺磁共振(EPR)参量的高阶微扰公式,计算了SrCl2中四角Ag2+中心的EPR参量(g因子g//,g⊥和超精细结构常数A因子A//,A⊥).由于体系的共价性及配体Cl-较大的旋轨耦合系数,在这些公式中同时考虑了配体轨道及旋轨耦合作用对EPR参量的贡献.公式里的能级分裂由重叠模型和杂质中心的局部结构确定.研究发现,掺杂后由于尺寸失配,杂质Ag2+沿着C4轴有一个很大的非中心位移,到最近邻的Cl-平面距离约为0.060 nm.计算所得的EPR理论值与与实验值符合的很好.
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