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首页> 外文期刊>High energy density physics >Corrections to statistical modeling of spectra for plasmas at moderate or low temperatures
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Corrections to statistical modeling of spectra for plasmas at moderate or low temperatures

机译：对中等或低温等离子体光谱统计模型的校正

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摘要

For plasmas in LTE at moderate or low temperatures (1-50?eV), the statistical approach for calculating emission or absorption spectra may become inaccurate and need improvement to account for the Boltzmann factor in the population of the levels. In this work, corrections to the transition rates are computed by using the moments of emission or absorption zones, which represent the set of levels within a configuration that provide the dominant part of the emissivity (or opacity). Partition functions are also improved by using high-order moments of level energy distributions. Corrections to the statistical models are derived in a non-relativistic framework as a function of these moments, which can be deduced from already published formulas. Numerical comparisons of detailed line-by-line and statistical calculations are presented that clearly illustrate the importance of correcting the models at low temperatures. Thus, these corrections are of great interest for applications such as Warm Dense Matter, LTE photo-absorption experiments where the targets are heated to ～T_e? equals ?20?eV and astrophysical plasmas.
机译：对于LTE处于中等或低温（1-50？eV）的等离子体，用于计算发射光谱或吸收光谱的统计方法可能会变得不准确，需要进行改进以考虑该水平总体中的玻耳兹曼因子。在这项工作中，通过使用发射区或吸收区的弯矩来计算跃迁速率的校正，这些弯矩代表了提供发射率（或不透明度）的主要部分的配置中的一组水平。通过使用能级能量分布的高阶矩，还可以改善分区功能。统计模型的校正是在非相对论框架中根据这些时刻而得出的，可以从已经发布的公式中推论得出。进行了逐行和统计计算的数值比较，清楚地说明了在低温下校正模型的重要性。因此，这些校正对于诸如热密物质，LTE光吸收实验等应用具有极大的兴趣，在这些实验中，目标被加热到T_e？等于？20？eV和天体等离子体。

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