Radiative opacities of hot and solid-dense aluminium plasmas using a detailed level accounting model
Radiative opacities of hot and solid-dense aluminium plasmas using a detailed level accounting model
复制标题
使用详细水平计算模型的热和固体致密铝等离子体的辐射不透明度
DOI：
10.1088/0953-4075/42/23/235701
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发表时间：
2009-12-14
影响因子：
1.6
通讯作者：
Yuan, Jianmin
中科院分区：
文献类型：
--
作者：
Li, Yongqiang;Wu, Jianhua;Yuan, Jianmin
基于自洽场(SCF)多组态Dirac-Fock(MCDF)模型，提出了一种考虑细节能级的热固体致密等离子体辐射不透明度的模拟方法。用通常的MCDF方法处理了束缚电子之间的关联效应和角动量耦合。通过引入对单电子势的修正来解释电离电子的屏蔽，考虑了等离子体屏蔽对跃迁能、振子强度和电离势的影响。这种修正依赖于不同离子中电离电子的详细微观空间分布。通过求解带有量子简并修正的Saha方程，得到了等离子体中电离电子的总平均数密度。基于原子场中的Thomas-Fermi分布描述了每个离子中的电离电子密度分布。由于电子结构和电离平衡相互依赖，SCF过程包括求解MCDF方程和SAHA方程。作为例子，计算了热的和固体致密的铝等离子体的光谱分辨辐射不透明度和Rosseland和Planck平均。将本模型、平均原子模型和实验结果进行了比较，说明了逐行处理对计算结果的重要意义。
An approach based on the self-consistent-field (SCF) multi-configuration Dirac-Fock (MCDF) model is developed to simulate radiative opacity of hot and solid-dense plasmas taking detailed levels into account. The correlation effects and the angular momentum coupling among the bound electrons are treated in the usual way employed in a normal MCDF method. Influences of plasma screening on transition energies, oscillator strengths and ionization potentials are included by introducing a correction to the one-electron potential to account for the screening of the ionized electrons. This correction depends on the detailed micro-space distribution of the ionized electrons in different ions. The total average number density of the ionized electrons in the plasma is obtained by solving the Saha equation with quantum degeneracy corrections. The ionized electron density distribution in each ion is described based on a Thomas-Fermi distribution in an atomic field. Since the electronic structure and the ionization balance depend on each other, the SCF procedure includes solving the MCDF and the Saha equations. As examples, calculations have been carried out to simulate the spectrally resolved radiative opacity and the Rosseland and Planck means of hot and solid-dense aluminium plasmas. Comparisons between the results of the present model, average atom model and experiments are made to show the significance of detailed line-by-line treatments on the calculated results.