The radiative recombination and photoionization cross sections as well as the radiative recombination rate coefficients and the radiated power loss rate coefficients are presented for the low-charged tungsten ions from W${}^{3+}$ to W${}^{13+}$. The data are essential to diagnostic and modeling the divertor plasmas impurities in the ITER tokamak because tungsten has been resolved to use as a plasma-facing material. Partial cross sections and rates are given for the ground and excited electron states with principal quantum numbers $n\le 10$ and orbital momenta $\ell \le 4$ in the wide energy range. Relativistic calculations have been performed taking into account all significant multipoles of the radiative field. Electron wave functions have been found by the Dirac–Fock method. The relativistic Maxwell–Jüttner distribution of continuum electrons has been used in calculations of radiative recombination and radiated power loss rates. Photoionization cross sections have been fitted by an analytical expression with five fit parameters. Peculiarities of behavior of the cross sections and rates for low-charged ions as well as ensuing problems of the cross section fitting are considered. The radiative recombination rates are compared with other recent calculations for the low-charged tungsten ions.

给出了来自W的低电荷钨离子的辐射复合和光电离截面以及辐射复合率系数和辐射功率损耗率系数${}^{3+}$ 到W${}^{13+}$。这些数据对于诊断和建模ITER托卡马克中的偏滤器等离子体杂质至关重要，因为已经确定了将钨用作面向等离子体的材料。给出了具有基本量子数的基态和受激电子态的部分截面和速率$ñ\le 10$ 和轨道动量 $\ell \le 4$在很宽的能量范围内。相对论计算已经考虑到了辐射场的所有重要多极。通过狄拉克-福克方法已经发现了电子波函数。相对论的连续电子的麦克斯韦-尤特纳分布已经用于辐射复合和辐射功率损耗率的计算。通过具有五个拟合参数的解析表达式拟合了光电离横截面。考虑了截面行为的特殊性和低电荷离子的速率，以及随之而来的截面拟合问题。将辐射复合率与低电荷钨离子的其他最新计算结果进行了比较。