Electron-impact excitation of forbidden and allowed transitions in Fe ii

Electron-impact excitation of forbidden and allowed transitions in Fe ii
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Fe-ii 中禁止和允许跃迁的电子碰撞激发

DOI:
10.1103/physreva.98.012706
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发表时间:
2018
期刊:
影响因子:
2.9
通讯作者:
Zatsarinny, O.
Zatsarinny, O.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tayal, S. S.;Zatsarinny, O.

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对 Feii 中各种跃迁的电子碰撞强度、速率系数和跃迁概率进行了广泛的计算。使用 B 样条 Breit-PauliR 矩阵方法在紧耦合近似中计算碰撞强度。采用与可调节构型展开和半经验微调程序相结合的多构型 Hartree-Fock 方法来准确表示目标波函数。通过在转换为中间耦合之前添加到哈密顿矩阵,能量校正也用于散射计算。在散射计算中,将自旋轨道相互作用项添加到最终的哈密顿矩阵中。紧耦合扩展包含Feian的340个精细结构级别,包括所有级别的、、、和配置,以及一些最低级别的配置。有效碰撞强度是通过对电子温度在 0 至 K 范围内的麦克斯韦速度分布上的电子碰撞强度进行平均而获得的,并且报告了 340 个精细结构水平之间所有可能的非弹性转变。目前的结果比之前的计算更广泛,并且大大扩展了 Feii 的现有数据集,从而可以更详细地处理来自不同空间天文台的可用测量光谱。与碰撞率和可用实验辐射率的其他计算进行比较,用于对我们的碰撞强度设置不确定性界限,并评估现有数据集中可能的不确定性。
Extensive calculations are reported for electron collision strengths, rate coefficients, and transitions probabilities for a wide range of transitions in Feii. The collision strengths were calculated in the close-coupling approximation using theB-spline Breit-PauliR-matrix method. The multiconfiguration Hartree-Fock method in connection with adjustable configuration expansions and a semiempirical fine-tuning procedure is employed for an accurate representation of the target wave functions. The energy correction was also used in the scattering calculations by adding to Hamiltonian matrices prior to transformation to intermediate coupling. The spin-orbit interaction term was added to the final Hamiltonian matrices in scattering calculations. The close-coupling expansion contains 340 fine-structure levels of Feiiand includes all levels of the,,, andconfigurations, plus a few lowest levels of theconfiguration. The effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities at electron temperatures in the range fromtoK and are reported for all possible inelastic transitions between the 340 fine-structure levels. The present results are more extensive than the previous calculations and considerably expand the existing data sets for Feii, allowing a more detailed treatment of the available measured spectra from different space observatories. Comparison with other calculations for collision rates and available experimental radiative rates is used to place uncertainty bounds on our collision strengths and to assess the likely uncertainties in the existing data sets.
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