温稠密等离子体中Al^12+离子的光电离过程  

Photoionization of Al^12+ion in warm dense plasmas

作　　者：施蕾蕾 赵国鹏 祁月盈[1] SHI Lei-Lei;ZHAO Guo-Peng;QI Yue-Ying(School of Mathematics&Physics and Information Engineering,Jiaxing University,Jiaxing 314001,China)

机构地区：[1]嘉兴学院数理与信息工程学院,嘉兴314001

出　　处：《原子与分子物理学报》2020年第6期896-903,共8页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金联合项目(U1530142);嘉兴学院SRT项目(CD8517193272)。

摘　　要：本文采用多组态Dirac-Hartree-Fock方法研究了温稠密等离子体环境中Al^12+离子的光电离过程.等离子体效应采用SM屏蔽势来模拟(Stanton和Murillo在2015年提出).计算中固定标度温度1.3 eV,在强耦合等离子体环境下,研究了等离子体密度对能级,连续态波函数以及光电离截面的影响.通过与相同等离子体条件下的Debye-Hückel模型势计算的光电离截面对比,发现两种模型对应的结果中未同时出现势形共振峰,这是由于本文采用的屏蔽模型包含等离子体简并、有限温度对动能的梯度修正和量子交换关联效应,对光电离截面的大小和共振结构具有显著影响.The photoionization process of Al^12+ion in warm dense plasmas is studied using the multiconfiguration Dirac-Hartree-Fock method.The plasma influence is simulated by SM screened potential(proposed by Stanton&Murillo in 2015).With fixed scaled temperature 1.3 eV,the energies,continuum wave functions and photoionization cross sections are investigated in the strongly coupled plasma environment for several plasma densities.As a comparison,the photoionization cross sections supported by the Debye-Hückel potential are also plotted with the same plasma parameters.The results showed that the shape resonances emerged in the photoionization cross sections supported by SM potential but not by the Debye-Hückel potential.The magnitudes and resonance structures of photoionization cross sections are significantly altered by the effects of plasma degeneracy,finite-temperature gradient corrections to the kinetic energy and quantum exchange-correlation,which involved in SM potential employed in this paper.

关 键 词：温稠密等离子体 SM屏蔽势 光电离截面 

分 类 号：O562[理学—原子与分子物理]