Structural properties of lithium atom under weakly coupled plasma environment
Structural properties of lithium atom under weakly coupled plasma environment
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DOI：
10.1063/1.4946878
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发表时间：
2016-04
影响因子：
2.2
通讯作者：
Sirshak Dutta;J. Saha;R. Chandra;T. K. Mukherjee
中科院分区：
文献类型：
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作者：
Sirshak Dutta;J. Saha;R. Chandra;T. K. Mukherjee
首次测试采用 Hylleraas 基组的 Rayleigh-Ritz 变分技术，以估计嵌入弱耦合等离子体环境中的锂原子的结构变化。 Debye-Huckel 势用于模拟弱耦合等离子体环境。类氦锂离子和锂原子的波函数均在显式相关的 Hylleraas 型基组中展开，该基组完全考虑了电子-电子相关效应。由于等离子体环境下的连续降低，系统的电离势逐渐降低，导致原子不稳定。激发态在等离子体密度较低时不稳定。估计的电离势与少数可用的理论估计相当吻合。还详细讨论了一个和两个粒子矩、介电敏感性和磁屏蔽常数相对于等离子体密度的变化。
The Rayleigh-Ritz variational technique with a Hylleraas basis set is being tested for the first time to estimate the structural modifications of a lithium atom embedded in a weakly coupled plasma environment. The Debye-Huckel potential is used to mimic the weakly coupled plasma environment. The wave functions for both the helium-like lithium ion and the lithium atom are expanded in the explicitly correlated Hylleraas type basis set which fully takes care of the electron-electron correlation effect. Due to the continuum lowering under plasma environment, the ionization potential of the system gradually decreases leading to the destabilization of the atom. The excited states destabilize at a lower value of the plasma density. The estimated ionization potential agrees fairly well with the few available theoretical estimates. The variation of one and two particle moments, dielectric susceptibility and magnetic shielding constant, with respect to plasma density is also been discussed in detail.