ELECTRON IMPACT EXCITATION COLLISION STRENGTHS FOR EXTREME ULTRAVIOLET LINES OF Fe vii
ELECTRON IMPACT EXCITATION COLLISION STRENGTHS FOR EXTREME ULTRAVIOLET LINES OF Fe vii
复制标题
Fe vii 极紫外谱线的电子撞击激发碰撞强度
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
O. Zatsarinny
中科院分区：
文献类型：
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作者：
S. Tayal;O. Zatsarinny
对具有天体物理意义的Fe VII极紫外线的电子碰撞激发碰撞强度和振子强度进行了广泛的计算。精细结构跃迁的碰撞强度用B-Spline Breit-Pauli R-矩阵方法计算。用多组态Hartree-Fock方法计算了含项非正交轨道的目标波函数。紧耦合展开包括3p63d2基态和3p53d3、3p63d4l、3p63d5s和3p63d5p组态的189个Fe vii精细结构能级。通过对电子速度的麦克斯韦分布进行积分，由电子激发碰撞强度确定有效碰撞强度。在104K到107K的电子温度范围内，给出了17766个精细结构跃迁的有效碰撞强度。我们的结果与先前Witthoeft和Badnell的R矩阵标架变换计算结果基本一致。然而，一些过渡与以前的计算有很大的不同。对以前结果的修正主要是由于Fe VII靶态的更广泛的展开。
Extensive calculations have been performed for electron impact excitation collision strengths and oscillator strengths for the Fe vii extreme ultraviolet lines of astrophysical importance. The collision strengths for fine-structure transitions are calculated in the B-spline Breit–Pauli R-matrix approach. The target wavefunctions have been calculated in the multiconfiguration Hartree–Fock method with term-dependent non-orthogonal orbitals. The close-coupling expansion includes 189 fine-structure levels of Fe vii belonging to terms of the ground 3p63d2 and excited 3p53d3, 3p63d4l, 3p63d5s, and 3p63d5p configurations. The effective collision strengths are determined from the electron excitation collision strengths by integration over a Maxwellian distribution of electron velocities. The effective collision strengths are provided for 17766 fine-structure transitions at electron temperatures from 104 to 107 K. Our results normally agree with the previous R-matrix frame-transformation calculations by Witthoeft & Badnell. However, there are important differences for some transitions with the previous calculations. The corrections to the previous results are mainly due to more extensive expansions for the Fe vii target states.