等离子体中原子光复合过程的相对论R矩阵理论研究

Photorecombination is an important atomic process affecting the plasma ionization balance and the spectral features, and it is also a key cooling mechanism in the hot plasmas. The atomic data of photorecombination is vital to the simulation and diagnostics of plasma. Photorecombination can proceed through the nonresonant radiative recombination and the resonant dielectronic recombination. The higher-order effects such as resonance-resonance and resonance-background interferences should be involved in order to treat photorecombination rigorously. Meanwhile, as the charge of the recombining ion increases, the relativistic effects and radiative damping become more and more significant. Accurate calculation of these higher-order effects is one of the difficulties in atomic and molecular physics at present. In this work, fully relativistic R-matrix method and code in which the scattering matrix including the radiative channels could be obtained precisely will be developed to investigate the influence of the interference effects, the relativistic effects and radiative damping on photorecombination in high-Z systems. The accurate atomic data of photorecombination obtained from this code could be applied to the spectral simulation and diagnostics of plasma in the inertial confinement fusion, the magnetic fusion and astrophysics.

光复合过程是等离子体中影响等离子体电离平衡以及光谱特性的一种重要原子物理过程，是高温等离子体的重要冷却机制之一，高精度的光复合过程原子数据是等离子体光谱模拟和诊断的必要基础。光复合过程包括非共振的辐射复合和共振的双电子复合过程。严谨处理该过程需要考虑共振态之间以及共振态和连续背景之间的干涉效应。同时，随着离子的核电荷数增加，光复合过程的相对论效应和辐射阻尼效应会变得越来越重要。这些高阶效应的高精度计算是目前原子分子物理研究的难点之一。本项目将发展全相对论R矩阵理论方法和计算程序，精确计算包含辐射通道的散射矩阵，深入研究干涉效应、相对论效应和辐射阻尼效应对高核电荷原子体系光复合过程的影响。得到的高精度光复合原子数据可以应用于惯性约束聚变、磁约束聚变和天体等环境中的等离子体光谱模拟和诊断。

光复合过程是等离子体中影响等离子体电离平衡以及光谱特性的一种重要原子物理过程，是高温等离子体的重要冷却机制之一，高精度的光复合过程原子数据是等离子体光谱模拟和诊断的必要基础。光复合过程包括非共振的辐射复合和共振的双电子复合过程。严谨处理该过程需要考虑共振态之间以及共振态和连续背景之间的干涉效应。同时，随着离子的核电荷数增加，光复合过程的相对论效应和辐射阻尼效应会变得越来越重要。这些高阶效应的高精度计算是目前原子分子物理研究的难点之一。本项目发展了全相对论R矩阵理论方法和计算程序，对包含辐射通道的散射矩阵进行了精确计算，深入研究了干涉效应、相对论效应和辐射阻尼效应对高核电荷原子体系光复合过程的影响。为惯性约束聚变、磁约束聚变和天体等环境中的等离子体光谱模拟和诊断提供了高精度的光复合原子数据。