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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 =- 5 87× 10 - 4cm- 1 ,而± 32 〉与± 52 〉之间的能级间隔为Δε2 =- 2 6 33× 10 - 4cm- 1 ;其各向异性朗德因子g∥ =2 1810 ,g⊥ =2 0 937;精细结构常数D =- 5 36× 10 - 4cm- 1 ;超精细结构常数A∥ =88 36× 10 - 4cm- 1 ,A⊥ =81 2 0× 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 〉.
The structure and the ultrafine structure of Mn2 + in single-crystal LiNbO3 were investigated by room-temperature electron spin resonance (ESR) .Analysis of ESR spectra showed that the energy level splitting values of zero magnetic field are: Spin angular momentum level ± 12> And the interval between ± 32> is Δε1 = - 5 87 × 10 - 4cm-1, and the energy level interval between ± 32> and ± 52> is Δε2 = -26 33 × 10 -4 cm -1; Anisotropy Rank coefficient g∥ = 2 1810, g⊥ = 2 0 937; fine structure constant D = -536 × 10 -4 cm -1; hyperfine structure constant A∥ = 88 36 × 10 -4 cm -1, A ⊥ = 81 2 0 × 10 - 4cm-1, that is, the fine structure interaction is much larger than that of the superfine structure.In addition, it is worth mentioning that two groups of obvious forbidden transitions were found in the experiment, 32> 12> and - 12> 52>.