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

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× 10 2 1cm-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。

Electron-impact excitation collision strengths among configuration-average levels from Fe-like Au53+ to Ge-like Au47+. ions have been calculated systematically based on Cowan's quasi-relativistic multi-configuration Hartree-Fock-Relativistic code and distorted-wave approaches. 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 lease-squares spline fitting procedure. The results indicate the error between our work and other theory is less then 10% in the diagnosed electron temperature about 2 keV. It is feasible to simulate the average ionized state and ionic abundance and charge state distribution in a highly ionized Au plasma.