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Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements; 4, Relativistic calculations for C IV and C V for UV and X-ray modeling

机译:天体上大量元素的电子离子复合速率系数和光电离截面; 4,用于UV和X射线建模的C IV和C V的相对论计算

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摘要

The first complete set of unified cross sections and rate coefficients are calculated for photoionization and recombination of He- and Li-like ions using the relativistic Breit-Pauli R-matrix method. We present total, unified (e + ion) recombination rate coefficients for (e + C VI ---> C V) and (e + C V \longrightarrow C IV) including fine structure. Level-specific recombination rate coefficients up to the n = 10 levels are also obtained for the first time; these differ considerably from the approximate rates currently available. Applications to recombination-cascade coefficients in X-ray spectral models of K-alpha emission from the important He-like ions is pointed out. The overall uncertainty in the total recombination rates should not exceed 10-20%. Ionization fractions for Carbon are recomputed in the coronal approximation using the new rates. The present (e + ion) recombination rate coefficients are compared with several sets of available data, including previous LS coupling results, and `experimentally derived' rate coefficients. The role of relativistic fine structure, resolution of resonances, radiation damping, and interference effects is discussed. Two general features of recombination rates are noted: (i) the non-resonant (radiative recombination) peak as E,T ---> 0, and the (ii) the high-T resonant (di-electronic recombination) peak.
机译:使用相对论的Breit-Pauli R-矩阵方法计算出第一组完整的统一截面和速率系数,以进行He和Li样离子的光电离和复合。我们提出了(e + C VI ---> C V)和(e + C V \ longrightarrow C IV)的总的,统一的(e +离子)重组率系数,包括精细的结构。还首次获得了n = 10级的特定于水平的重组率系数。这些与目前可用的大致费率有很大不同。指出了重要的类He离子在K-α发射的X射线光谱模型中的复合级联系数的应用。总重组率的总体不确定性不应超过10-20%。碳的电离分数以新的速率在日冕近似中重新计算。将当前的(e +离子)重组速率系数与几组可用数据进行比较,包括先前的LS耦合结果和“实验得出”的速率系数。讨论了相对论精细结构,共振分辨率,辐射阻尼和干涉效应的作用。注意到重组率的两个一般特征:(i)非共振(辐射重组)峰为E,T-> 0,以及(ii)高T共振(双电子重组)峰。

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