两体德拜势下等离子体嵌入类锂体系屏蔽效应的相对论谱学
Relativistic Spectroscopy of Plasma Embedded Li-like Systems with the Screening Effects in the Two-body Debye Potentials
摘要：
利用相对论耦合团簇（RCC）方法研究了等离子体环境中Li原子和类Li Ca、Ti离子的光谱性质。假设等离子体是低密度和非常热的，我们考虑德拜模型与两个近似通过帐户屏蔽效应：（i）在核势单独和（ii）在核和电子-电子相互作用势。首先，对无等离子体系统进行了原子态的能量和寿命的计算，以检查它们的准确性，然后在等离子体环境中对其进行了研究。据观察，屏蔽在电子-电子相互作用势稳定的系统比的情况下，屏蔽只存在于核势。类似地，早先预测的蓝移和红移的$Δn=0$和$Δn \ne 0$过渡线（与主量子数$n$）的锂离子的变化显着的情况下（ii）近似。观察到的能级之间的水平交叉的大屏蔽效应，似乎是突出的高轨道角动量的状态。考虑到不同的等离子体屏蔽强度，估计了许多低能级的寿命和允许跃迁的相对谱线强度。
英文摘要：
The spectroscopic properties of Li atom and Li-like Ca and Ti ions in the plasma environment are investigated using a relativistic coupled-cluster (RCC) method. Assuming the plasma is of low density and very hot, we consider the Debye model with two approximations by accounting the screening effects: (i) in the nuclear potential alone and (ii) in both the nuclear and the electron-electron interaction potentials. First, the calculations for the energies and the lifetimes of the atomic states are carried out for the plasma free systems in order to check their accuracies following which they are investigated in the plasma environment. It is observed that screenings in the electron-electron interaction potentials stabilize the systems more than the case when the screenings present only in the nuclear potential. Similarly, the earlier predicted blue and red shifts in the $Δn=0$ and $Δn \ne 0$ transition lines (with the principal quantum number $n$) of the Li-like ions change significantly in the case (ii) approximation. The level-crossings among the energy levels are observed for the large screening effects which seem to be prominent in the states of higher orbital angular momentum. The lifetimes of many low-lying states and the relative line-intensities of the allowed transitions are estimated considering different plasma screening strengths.
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