非平衡等离子体中原子过程的计算

Calculations of Atomic Processes in Nlte Plasmas

为得到由中、高Z元素形成的非局域热动平衡等离子体中的离子丰度分布的可靠信息 ,对建立速率方程所需的各种离子的各个原子过程采用了基于一级微扰论的计算 ,提高了原子参数的精度 ;为了进一步节省计算时间 ,在保证精度的前提下 ,针对不同的过程做了不同的近似处理 ;对各个原子过程的计算结果进行多方比较 ,表明精度可靠 .

The atomic processes which involves in the non-local-thermodynamic-equilibrium(NLTE) rate equations are calculated based on the first order perturbation theory. Various approximations are applied for different processes in order to reduce computer time. Comparisons are made between the present results and those of other calculations for various processes. The accuracy of the present methods is within 30%.