Oreshkina Natalia S, Cavaletto Stefano M, Keitel Christoph H, Harman Zoltán
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Phys Rev Lett. 2014 Oct 3;113(14):143001. doi: 10.1103/PhysRevLett.113.143001. Epub 2014 Sep 29.
Line intensities and oscillator strengths for the controversial 3C and 3D astrophysically relevant lines in neonlike Fe(16+) ions are calculated. A large-scale configuration-interaction calculation of oscillator strengths is performed with the inclusion of higher-order electron-correlation effects, suggesting that these contributions cannot explain existing discrepancies between theory and experiment. Then, we investigate nonlinear dynamical effects, showing that, for strong x-ray sources, the modeling of the spectral lines by a peak with an area proportional to the oscillator strength is not sufficient. The dynamical effects give a possible resolution of discrepancies of theory and experiment found by recent measurements, which motivates the use of light-matter interaction models also valid for strong light fields in the analysis and interpretation of astrophysical and laboratory spectra.
计算了类氖铁（Fe(16+)）离子中存在争议的3C和3D天体物理相关谱线的谱线强度和振子强度。在考虑高阶电子关联效应的情况下，对振子强度进行了大规模的组态相互作用计算，结果表明这些贡献无法解释理论与实验之间现有的差异。然后，我们研究了非线性动力学效应，结果表明，对于强X射线源，用面积与振子强度成正比的峰对谱线进行建模是不够的。动力学效应为最近测量中发现的理论与实验差异提供了一种可能的解决方案，这促使在天体物理和实验室光谱的分析与解释中使用同样适用于强光场的光与物质相互作用模型。
