Super-transition-arrays: A model for the spectral analysis of hot, dense plasma.
Super-transition-arrays: A model for the spectral analysis of hot, dense plasma.
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DOI：
10.1103/physreva.40.3183
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发表时间：
1989-09
期刊：
影响因子：
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通讯作者：
A. Bar-Shalom;J. Oreg;W. Goldstein;D. Shvarts;A. Zigler
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文献类型：
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作者：
A. Bar-Shalom;J. Oreg;W. Goldstein;D. Shvarts;A. Zigler
提出了一种计算局部热力学平衡等离子体束缚辐射的方法。特定单电子跃迁的总跃迁阵列，包括所有可能的贡献构型，仅由少数超级跃迁阵列（STA's）描述。给出了STA的前几个矩的精确解析表达式。结果表明，该方法可以在平均原子（AA）结果和未解析跃迁阵列（UTA）方法基础上的详细配置计算之间平滑地进行插值。每个STA以其自身的优化势能计算，模型在STA的数量上实现了快速收敛。将预测的STA光谱与AA和UTA方法的结果进行了比较。结果表明，在一定的等离子体条件下，低概率跃迁的贡献可以累积成为发射的重要组成部分。在这些情况下，详细的配置记帐是不切实际的。另一方面，在这种条件下的光谱的详细结构不能用AA法描述。讨论了STA方法在激光等离子体实验中的应用。
A method is presented for calculating the bound-bound emission from a local thermodynamic equilibrium plasma. The total transition array of a specific single-electron transition, including all possible contributing configurations, is described by only a small number of super-transition-arrays (STA's). Exact analytic expressions are given for the first few moments of an STA. The method is shown to interpolate smoothly between the average-atom (AA) results and the detailed configuration accounting that underlies the unresolved transition array (UTA) method. Each STA is calculated in its own, optimized potential, and the model achieves rapid convergence in the number of STA's included. Comparisons of predicted STA spectra with the results of the AA and UTA methods are presented. It is shown that under certain plasma conditions the contributions of low-probability transitions can accumulate into an important component of the emission. In these cases, detailed configuration accounting is impractical. On the other hand, the detailed structure of the spectrum under such conditions is not described by the AA method. The application of the STA method to laser-produced plasma experiments is discussed.