Spectrally resolved and Rosseland and Planck mean opacities of iron plasmas at temperatures above 100 eV: a systematic study.
Spectrally resolved and Rosseland and Planck mean opacities of iron plasmas at temperatures above 100 eV: a systematic study.
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DOI：
10.1103/physreve.78.046407
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发表时间：
2008-10
期刊：
影响因子：
--
通讯作者：
Gao Cheng;Z. Jiaolong
中科院分区：
文献类型：
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作者：
Gao Cheng;Z. Jiaolong
高温铁等离子体的辐射不透明度在天体物理中具有重要意义。利用详细能级计算（DLA）模型研究了高温、不同密度铁等离子体的光谱分辨辐射不透明度和Rosseland-Planck平均。原子数据的准确性，如能级和跃迁概率，是通过与美国国家标准与技术研究所的数据进行比较来检查的。详细研究了温度为156 eV、电子密度为6.9 x 10（21）cm（-3）的铁等离子体的透射率，并与最近的实验结果进行了比较[Bailey等人，物理修订信函99，265002（2007）]和其他理论结果。一般良好的协议之间发现我们的DLA传输和实验及其他理论结果。通过使用我们开发的DLA模型，我们可以推断出在实验中产生的等离子体的物理条件的有价值的信息。这些信息包括不同离子级的分数分布以及等离子体是否处于局部热力学平衡。说明性的结果给出了三个等温序列的100，150，和200 eV的不同的质量密度和三个等密度序列的0.1，0.05，和0.01克/立方厘米与不同的温度。Rosseland和Planck平均不透明度与其他理论结果进行了比较，得到的洛斯阿拉莫斯轻元素详细配置不透明度代码。
The radiative opacity of iron plasmas at high temperatures is very important in astrophysics. The spectrally resolved radiative opacity and Rosseland and Planck means were investigated by using the detailed-level-accounting (DLA) model for iron plasmas at high temperatures and a variety of density. The accuracy of atomic data such as energy levels and transition probabilities is checked by comparison with data from the National Institute of Standards and Technology. The transmission of iron plasma at a temperature of 156 eV and an electron density of 6.9 x 10(21) cm(-3) is studied in detail and compared with results of a recent experiment [Bailey et al., Phys. Rev. Lett. 99, 265002 (2007)] and other theoretical results. General good agreement is found between our DLA transmission and the experimental and other theoretical results. By using our developed DLA model, we can deduce valuable information on the physical condition of the plasma created in the experiment. The information includes the fractional distribution of different ion stages and whether the plasma is in local thermodynamic equilibrium or not. Illustrative results are given for three isothermal sequences of 100, 150, and 200 eV with different mass densities and for three isodensity sequences of 0.1, 0.05, and 0.01 g/cm3 with different temperatures. The Rosseland and Planck mean opacities are compared with other theoretical results obtained by the Los Alamos light element detailed configuration opacity code.