Au等离子体M带5f-3d跃迁的电子离子碰撞激发速率系数
Collision excitation rate coefficients by electron impact in a highly ionized Au plasma
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摘要: 电子离子碰撞激发速率系数在超组态碰撞辐射模型中真实模拟非局域热动力学平衡Au激光等离子体M带谱5f-3d跃迁中各种复杂电荷态离子的电离态特性(譬如离子的平均电离度，相对丰度和能级布居数)是必不可少的。基于准相对论多组态Hartree Fock方法和扭曲波玻恩交换近似，采用自编的扭曲波程序ACDW（9）和Fit(9)，从头计算了Au等离子体M带5f-3d电子离子碰撞激发速率系数。结果表明：在“神光II”实验装置诊断的电子温度约2keV，电子密度约 6×1021cm-3范围内，这些电子离子碰撞激发参数有利于采用超组态碰撞辐射模型模拟Au的激光等离子体M带5f-3d细致谱的平均电离度和电荷态分布。Abstract: Electronimpact excitation collision strengths among configurationaverage levels from Felike Au 53+ to Ge like Au 47+ ions have been calculated systematically based on Cowan's quasi relativistic multi configuration Hartree Fock Relativistic code and distorted wave approachs. The data for the collision strengths and thermally averaged rate coefficients over the whole range of energy or electron temperature have been evaluated by a leasesquares spline fitting procedure. The results indicate the error between our work and other theory is less then 10% in the diagnosed electron temperature about 2keV. It is feasible to simulate the average ionized state and ionic abundance and charge state distribution in a highly ionized Au plasma
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Key words:
- electron impact excitation /
- au plasma /
- rate coefficients
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