单晶LiNbO3:Mn2+的ESR谱研究

用室温电子自旋共振（ESR）实验研究单晶LiNbO3中Mn2+的精细结构和超精细结构.对ESR谱的分析得出,零磁场的能级分裂数值：自旋角动量能级±12〉与±32〉之间的间隔为Δε1=-587×10-4cm-1,而±32〉与±52〉之间的能级间隔为Δε2=-2633×10-4cm-1；其各向异性朗德因子g∥=21810，g⊥=20937；精细结构常数D=-536×10-4cm-1；超精细结构常数A∥=8836×10-4cm-1，A⊥=8120×10-4cm-1，即精细结构相互作用要比超精细结构相互作用大得多.另外，特别值得提到的是实验中还发现两组明显的禁戒跃迁，-32〉12〉和-12〉52〉. 关键词： 单晶 精细结构 超精细结构 禁戒跃迁

ESR study of the Mn2+ center in LiNbO3

Fine structure and hyperfine structure of Mn2+ in LiNbO3 are analyzed with electron spin resonance (ESR) at room temperature. It is concluded that the zero-field splitting of energy levels of electron spin angular moment between ±12〉 and ±32〉 is Δε1=-587×10-4cm-1, and that between ±32〉 and ±52〉 is Δε2=-2633×10-4cm-1. The anisotropic La nde factors are g∥=21810，and g⊥=20937 The fine structure co nstant is D=-536×10-4cm-1, and hyperfine structure constants ar e A∥=8836cm-1 and A⊥=8120×10-4cm-1. The interaction action of the fine structure is larger than that of the hyperfine structure. In addition, it is worth paying special attention to the fact that two forbidden transitions -32〉12〉 and -12〉52〉 are found.