等离子体屏蔽效应对原子能级和振子强度的影响

利用Debye模型，研究了等离子体屏蔽效应对热等离子体中原子能级和振子强度的影响.通过在MCDF模型中引入等离子体屏蔽效应，计算了MnXXII-BrXXII等11个类Be离子在等离子体环境下2s²—［2s_1/2,2p_1/2］₁和2s²—［2s_1/2,2p_3/2］₁跃迁的能级和振子强度.计算结果表明，等离子体屏蔽效应使得类Be离子2s²—［2s_1/2,2p_1/2］₁跃迁的激发能量增大，从而导致谱线蓝移现象；并且随着屏蔽效应的不断增强，蓝移的程度会逐渐加大.屏蔽效应对于2s²—［2s_1/2,2p_3/2］₁跃迁的振子强度也有类似的影响. 关键词： Debye 等离子体屏蔽 跃迁能级 振子强度

Influence of Debye-screening on atomic energy levels and oscillator strengths

The influence of plasma screening on the energy levels and oscillator strength for ions in a high-temporary plasma is investigated by using the Debye-model. The 2s²—［2s_1/2,2p_1/2］₁ and 2s²—［2s_1/2,2p_3/2］₁ transitions of 11 beryllium-like ions from MnXXII to BrXXXII are calculated by including the effect of plasma-screening. The results show that the effect of plasma-screening increases the 2s²—［2s_1/2,2p_1/2］₁ transition energy of beryllium-like ions, which leads to a blue-shift; it also shows that the blue-shift becomes more and more obvious as the plasma-screening increases. The overall trend for the oscillator strength of the 2s²—［2s_1/2,2p_3/2］₁ transition is similar to that of the transition energy.