Structural properties of 1s²nl (²L) [n = 2–5, l = 0–4; where, n and l are the principal quantum number and orbital angular momentum quantum number, respectively] states of Li atom embedded in classical weakly coupled plasma (WCP) and dense quantum plasma (DQP) have been discussed. The Debye-Hckel potential or the screened-Coulomb potential (SCP) and exponential-cosine-screened Coulomb potential (ECSCP) have been used to mimic the WCP and DQP, respectively. Li atom has been treated as a composite system with a frozen core Li⁺ ion and a chemically active valence electron. The Rayleigh-Ritz variational method with Hylleraas-type basis set has been used to estimate the energy eigenvalue of 1s² (¹S) state of Li⁺ ion core and a pure exponential basis has been considered to compute the energy of nl (²L) states of the valence electron of Li atom. The influence of ECSCP and SCP on the radial probability distribution of the valence electron of the Li atom has also been studied.

中文翻译：

---

量子等离子体和经典等离子体下锂原子的结构特性：复合变分框架

1 s ² nl ( ² L) [ n  = 2–5, l  = 0–4; 其中，n和l分别是主要量子数和轨道角动量量子数] 讨论了嵌入在经典弱耦合等离子体 (WCP) 和致密量子等离子体 (DQP) 中的锂原子的状态。Debye- Hckel 势或筛选库仑势 (SCP) 和指数余弦筛选库仑势 (ECSCP) 已分别用于模拟 WCP 和 DQP。Li原子已被视为具有冷冻核Li ⁺的复合系统离子和化学活性价电子。使用具有 Hylleraas 型基组的 Rayleigh-Ritz 变分方法来估计Li ⁺离子核的 1 s ² ( ¹ S) 态的能量特征值，并考虑使用纯指数基计算nl ( ² L) Li原子的价电子态。还研究了ECSCP和SCP对Li原子价电子径向概率分布的影响。