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系统地分析了稀土离子在真空紫外区域 (VUV :λ <2 0 0nm ,E >5 0 0 0 0cm-1)的 4fn → 4fn -15d组态间跃迁光谱。结果发现 ;对于重镧系离子 (n >7) ,激发光谱中有一系列强的f d吸收谱带 ,在低能量处还有一些弱的f d吸收带 ,它们分别是稀土离子的自旋允许和自旋禁阻跃迁 ;而对于轻镧系离子 (n≤7) ,谱图中只有强的f d吸收谱带 ,对应于稀土离子的自旋允许跃迁。
The transition spectra of rare earth ions in the 4fn → 4fn-15d configuration of vacuum ultraviolet region (VUV: λ <2000 nm, E> 500 ° cm-1) were systematically analyzed. The results show that there is a series of strong fd absorption bands in the excitation spectra for heavy lanthanide ions (n> 7) and some weak absorption bands for fd at low energy, which are spin-permittivity of rare earth ions and For the light lanthanide ions (n≤7), there are only strong fd absorption bands in the spectrum corresponding to spin-allowed transitions of rare earth ions.