Energy levels, radiative rates and electron impact excitation rates for transitions in He-like Li II, Be III, B IV and C V
Energy levels, radiative rates and electron impact excitation rates for transitions in He-like Li II, Be III, B IV and C V
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DOI：
10.1088/0031-8949/83/01/015302
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发表时间：
2010
期刊：
影响因子：
2.9
通讯作者：
K. Aggarwal;T. Kato;F. Keenan;I. Murakami
中科院分区：
文献类型：
--
作者：
K. Aggarwal;T. Kato;F. Keenan;I. Murakami
本文报道了类氦LiⅡ、Be III、B IV和C V跃迁的能级、辐射率和电子碰撞激发率的计算。为了确定碰撞强度和随后的激发率，使用了狄拉克原子R矩阵代码(DARC)。报告了每个离子的最低49个能级中的所有E1、E2、M1和M2跃迁的振子强度、辐射率和谱线强度。碰撞强度在麦克斯韦速度分布上被平均，这样获得的有效碰撞强度在高达106K的宽温度范围内被报告。与从灵活原子代码(FAC)获得的类似数据进行了比较，以强调在DARC计算中包括的共振在确定有效碰撞强度中的重要性。还讨论了DARC和FAC碰撞强度之间的差异，特别是在弱跃迁和低能情况下。此外，还列出了上述四种离子的所有计算能级的寿命。
We report calculations for energy levels, radiative rates and electron impact excitation rates for transitions in He-like Li II, Be III, B IV and C V. grasp (general-purpose relativistic atomic structure package) is adopted for calculating energy levels and radiative rates. For determining the collision strengths and subsequently the excitation rates, the Dirac atomic R-matrix code (darc) is used. Oscillator strengths, radiative rates and line strengths are reported for all E1, E2, M1 and M2 transitions among the lowest 49 levels of each ion. Collision strengths have been averaged over a Maxwellian velocity distribution and the effective collision strengths so obtained are reported over a wide temperature range up to 106 K. Comparisons have been made with similar data obtained from the flexible atomic code (fac) to highlight the importance of resonances, included in calculations from darc, in the determination of effective collision strengths. Discrepancies between the collision strengths from darc and fac, particularly for weak transitions and at low energies, have also been discussed. Additionally, lifetimes are also listed for all calculated levels of the above four ions.