稠密等离子体中类锂铝的原子结构研究

Study of atomic structures of Li-like Al in dense plasmas

摘要:

等离子体中原子结构的研究对于等离子体诊断和天文学观测有着非常重要的参考价值. 本文采用MCDF方法结合离子球模型研究了稠密等离子体对类锂铝离子的能级和跃迁参量(跃迁能、跃迁几率和振子强度)的影响情况. 随着等离子体屏蔽强度的不断增强，上述原子结构参量变化如下：1s22p (2P1/2, 3/2)的能级不断升高，但1s23s (2S1/2)、1s23p (2P1/2, 3/2)和1s23d (2D3/2, 5/2)的能级却不断降低；不同主量子数间的跃迁对应的跃迁参量均不断减小；除了1s23s (2S1/2) - 1s23p (2P1/2, 3/2)间的跃迁外，同一主量子数间的跃迁对应的跃迁参量均不断增大；1s23s (2S1/2) - 1s23p (2P1/2, 3/2)的跃迁参量均先增大后减小；在跃迁的精细结构中，△J=1对应的跃迁几率和振子强度较大，而△J=0的则相对较小.

Abstract:

The study of atomic structures in dense plasmas has a very important reference value for plasma diagnosis and astronomical observation. The MCDF method combined with ion sphere model are used in this work to investigate the influence of dense plasmas on the energy levels and transition parameters (transition energies, transition probabilities and oscillator strengths) of the Li-like Al ion in dense plasmas. With the increase of plasma screening intensity, the changes of the atomic structural parameters mentioned above are listed below: The energy levels of 1s22p (2P1/2,3/2) increase, but those of 1s23s (2S1/2), 1s23p (2P1/2,3/2) and 1s23d (2D3/2,5/2) decrease. The transition parameters of transitions between different principle quantum number n decrease. The transition parameters of transitions between the same principle quantum number n increase, except that of 1s23s (2S1/2) - 1s23p (2P1/2,3/2). The transition parameters of transitions between 1s23s (2S1/2) - 1s23p (2P1/2,3/2) increase first and then decrease with the rise of free electron densities. In the fine structures of one transition, the transition probabilities and oscillator strengths for △J=1 are greater, but those for △J=0 are relatively smaller.