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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Energy levels, radiative rates and electron impact excitation rates for transitions in He-like Mg XI, Al XII, P XIV and S XV
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Energy levels, radiative rates and electron impact excitation rates for transitions in He-like Mg XI, Al XII, P XIV and S XV

机译：像He一样的Mg XI，Al XII，P XIV和S XV中跃迁的能级，辐射速率和电子冲击激发速率

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摘要

We report calculations of energy levels, radiative rates and electron impact excitation cross sections and rates for transitions in He-like Mg XI, Al XII, P XIV and S XV. The GRASP (general-purpose relativistic atomic structure package) code is adopted to calculate energy levels and radiative rates. To determine 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 are averaged over a Maxwellian velocity distribution and the effective collision strengths obtained are listed over a wide temperature range up to 10~(7.2) K. Comparisons are made with similar data obtained from the flexible atomic code (FAC) to highlight the importance of resonances, included in calculations with DARC, in the determination of effective collision strengths. Discrepancies between the collision strengths from DARC and FAC, particularly for forbidden transitions, are also discussed. Additionally, theoretical lifetimes are listed for all the 49 levels of the above four ions.
机译：我们报告了能级，辐射速率和电子冲击激发截面的计算以及He样Mg XI，Al XII，P XIV和S XV中跃迁的速率。采用GRASP（通用相对论原子结构软件包）代码来计算能级和辐射率。为了确定碰撞强度以及随后的激发速率，使用了狄拉克原子R-矩阵码（DARC）。报告了每个离子的最低49能级中所有E1，E2，M1和M2跃迁的振荡器强度，辐射速率和线强度。碰撞强度是在麦克斯韦速度分布上平均的，列出的有效碰撞强度是在高达10〜（7.2）K的宽温度范围内列出的。与从柔性原子代码（FAC）获得的相似数据进行了比较，以突出其重要性确定有效碰撞强度时，在DARC的计算中包含了共振。还讨论了DARC和FAC的碰撞强度之间的差异，尤其是对于禁止的过渡而言。此外，列出了上述四个离子的所有49个能级的理论寿命。

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