利用全相对论组态相互作用理论方法,研究了W^28+离子由基态俘获一个电子形成双激发态(3d^104s^24p^64d^10)^-1nln'l'(n=4~6,n'=4-15)的双电子复合(DR)过程.比较分析了3s、3p、3d、4s、4p和4d电子激发对DR速率系数的贡献,分析了3d、4s、4p和4d电子激发的DR速率系数随轨道量子数l'的变化.考虑和已有的计算完全相同的初态,中间双激发态以及辐射和俄歇末态的情况下,得到了和已有的计算符合很好的结果 .在综合了分析得到的对W^28+离子DR过程有明显贡献的各种因素后,进一步得到了总DR速率系数.其中,考虑DAC效应对总DR速率系数有不可忽略的影响.对DR速率系数进行了参数拟合,拟合值与计算值的偏差小于1%.
Theoretical calculations have been made for dielectronic recombination (DR) rate coefficients of W^28+ ions using a flexible relativistic atomic code. The contributions from 3s,3p,3d,4s,4p and 4d sub - shell excited are discussed. The l' dependences of the partial rate coefficients for (3d^104s^24p^64d^10)^-1nln'l' are investigated. The total DR rate coefficients considering various important factors show that radiative cascades (DAC) are very important. In order to facilitate applications, the fitting parameters with error of 1% have been given.