Nb XIII离子3d^94s^2,3d^94s4p,3d^94p^2组态能级结构与跃迁的理论研究

Theoretical study of level structure and transitions of configurations 3d^94s^2,3d^94s4p,3d^94p^2 for Nb XIII

用准相对论Hartree-Fock方法对Nb XIII离子二电子激发组态3d94s2,3d94s4p,3d94p2的能级结构做了全面系统的理论计算研究.在对已有研究结果分析的基础上,运用最小二乘方法对径向积分参数进行了优化计算,得到了与这些组态有关的电偶极允许跃迁的谱线波长和跃迁概率.计算结果与最新的实验值做了对比分析,表明本文计算结果是准确的.研究发现,波长40.92nm的谱线,属于3d94s(1D)4p2F7/2—3d9(2D)4s22D5/2的跃迁谱线,而不属于3d94s(1D)4p4D7/2—3d9(2D)4s22D5/2的跃迁谱线,即上谱项能级为2F7/2,而不是4D7/2.

Fine-structure energy levels of two-electron excitation configurations 3d94s2,3d94s4p,3d94p2 are calculated by Hartree-Fock method,which includes the configuration interaction,relativistic correction and approximate Breit correction,for copper-like Nb XIII.More accurate levels are obtained by the least-square-fit technique.The wavelengths and transition probabilities of 3d94s4p-3d104s,3d94s2-3d104p,3d94p2-3d104p,3d94s4p-3d94s2 transition array are obtained,and some unknown results are predicted.Computing research shows that the 40.92 nm line should belong to 3d94s（1D）4p 2F7/2-3d9（2D）4s2 2D5/2 transition,but not to the 3d94s（1D）4p 4D7/2-3d9（2D）4s2 2D5/2 transition,and the upper term level should be 2F7/2,but not 4D7/2.