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首页> 外文期刊>High energy density physics >Dynamic linear response of atoms in plasmas and photo-absorption cross-section in the dipole approximation
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Dynamic linear response of atoms in plasmas and photo-absorption cross-section in the dipole approximation

机译：等离子体中原子的动态线性响应和偶极近似中的光吸收截面

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We report results on the self-consistent linear response theory of quantum average-atoms in plasmas. The approach is based on the two first orders of the cluster expansion of the plasma susceptibility. A change of variable is applied, which allows us to handle the diverging free-free transitions contribution in the self-consistent induced electron density and potential. The method is first tested on the case of rare gas isolated neutral atoms. A test of the Ehrenfest-type sum rule is then performed in a case of an actual average-atom in a plasma. At frequencies much higher than the plasma frequency, the sum rule seems to be fulfilled within the accuracy of the numerical methods. Close to the plasma frequency, the method seems not to account for the cold-plasma dielectric function renormalization in the sum rule, which was correctly reproduced in the case of the Thomas-Fermi-Bloch self-consistent linear response. This suggests the need for a better accounting for the outgoing waves in the asymptotic boundary conditions. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们报告了等离子体中量子平均原子的自洽线性响应理论的结果。该方法基于等离子体敏感性的簇扩展的两个第一阶。应用变量的变化，这使我们能够处理自洽感应电子密度和电势中发散的自由-自由跃迁贡献。首先在稀有气体隔离的中性原子的情况下测试该方法。然后，在等离子体中存在实际平均原子的情况下，进行Ehrenfest型求和规则的测试。在比等离子体频率高得多的频率上，求和规则似乎在数值方法的精度范围内已得到满足。在接近等离子体频率的情况下，该方法似乎没有考虑总和规则中的冷等离子体介电函数重新归一化，该规则在Thomas-Fermi-Bloch自洽线性响应的情况下已正确再现。这表明需要更好地考虑渐近边界条件下的输出波。 （C）2015 Elsevier B.V.保留所有权利。

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