Cr^(21+)离子1s^22s-1s^2np的跃迁能和偶极振子强度

Transition energy and dipole oscillator strength for the 1s^22s-1s^2np of Cr^(21+) ion

用全实加关联方法计算了类锂Cr21+离子1s22s-1s2np(2≤n≤9)的跃迁能和1s2np(n≤9)态的精细结构.依据单通道量子亏损理论,确定了Rydberg系列1s2np的量子数亏损.用这些作为能量的缓变函数的量子亏损,可以实现对任意高激发态(n≥10)的能量的可靠预言.用在计算能量过程中确定的波函数,计算了Cr21+离子1s22s-1s2np(2≤n≤9)跃迁的振子强度.将这些分立态振子强度与单通道量子亏损理论相结合,得到该离子从基态到电离阈附近高激发束缚态间的偶极跃迁振子强度以及束缚态-连续态跃迁的振子强度密度,从而将Cr21+离子的这一重要光谱特性的理论预言外推到整个能域.

The transition energy of 1s^2 2s-1s^2 np （2≤n≤9） and fine structure splitting of 1s^2 np （1=s, p; n≤9） states for lithium-like Cr^21＋ ion are calculated by using the full-core plus correlation method. The quantum defect of Rydberg series 1s^2 np is determined according to the single-channel quantum defect theory. The energies of any highly excited states with （n≥10） for this series can be reliably predicted using the quantum defects which are function of energy. The dipole oscillator strengths for the 1s^2 2s-1s^2 np （n≤9） transitions of Cr^21＋ ion are calculated with the energies and FCPC wave functions obtained above. By combining the quantum defect theory with the discrete oscillator strengths, the discrete oscillator strengths for the transitions from initial state 1s^2 2s to highly excited states （n≥10） and the oscillator strengths density corresponding to the bound-free transitions are obtained.