标题： K壳层光吸收研究碳同核素序列 显示英文标题

标题： K-Shell Photoabsorption Studies of the Carbon Isonuclear Sequence

摘要： K壳层光吸收截面对于同核的C I - C IV离子已经使用R矩阵方法计算出来。 在K壳层阈值以上，目前的结果与Reilman和Manson（1979）的独立粒子结果有很好的一致性。 在阈值以下，我们还计算了重要的旁观者俄歇展宽效应的1s -> np吸收共振。 对于最低的1s -> 2p, 3p共振，与现有的C II, C III和C IV实验结果进行比较，显示共振强度和位置总体上一致，但存在未解释的差异。 我们的结果还提供了关于C I K壳层光吸收截面的详细信息，包括强共振特征，因为实验室实验数据非常有限。 然后将得到的R矩阵截面用于模拟blazar Mkn 421的钱德拉X射线吸收谱。 显示英文摘要

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.