碳同位素序列的K壳层光吸收研究
K-Shell Photoabsorption Studies of the Carbon Isonuclear Sequence
摘要：
用R矩阵方法计算了等离子体C1-CIV离子的K壳层光吸收截面。在K壳层阈值以上，本文的结果与Reilman & Manson（1979）的独立粒子结果符合得很好。在阈值以下，我们还计算了强的1 s-> np吸收共振，其中包括重要的旁观者俄歇加宽效应。对于最低的1 s-> 2 p，3 p共振，与现有的C II，C III和C IV实验结果的比较显示共振强度和位置总体上良好的一致性，但存在无法解释的差异。我们的研究结果还提供了详细的信息，包括强共振特性的C I K壳光吸收截面，因为非常有限的实验室实验数据存在。由此产生的R矩阵截面，然后被用来模拟的钱德拉X射线吸收光谱的耀变体MKN 421。
英文摘要：
K-shell photoabsorption cross sections for the isonuclear C I - C IV ions have been computed using the R-matrix method. Above the K-shell threshold, the present results are in good agreement with the independent-particle results of Reilman & Manson (1979). Below threshold, we also compute the strong 1s -> np absorption resonances with the inclusion of important spectator Auger broadening effects. For the lowest 1s -> 2p, 3p resonances, comparisons to available C II, C III, and C IV experimental results show good agreement in general for the resonance strengths and positions, but unexplained discrepancies exist. Our results also provide detailed information on the C I K-shell photoabsorption cross section including the strong resonance features, since very limited laboratory experimental data exist. The resultant R-matrix cross sections are then used to model the Chandra X-ray absorption spectrum of the blazar Mkn 421.
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