Heidelberg 2015 – wissenschaftliches Programm
A 30.5: Vortrag
Donnerstag, 26. März 2015, 12:00–12:15, M/HS1
Astrophysical line diagnosis requires non-linear dynamical atomic modeling — •Natalia S. Oreshkina, Stefano M. Cavaletto, Christoph H. Keitel, and Zoltán Harman — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
Line intensities and oscillator strengths for the controversial 3C and 3D astrophysically relevant lines in neonlike Fe16+ ions are
calculated . First, a large-scale configuration-interaction calculation of oscillator strengths is performed with the inclusion of
higher-order electron-correlation effects. Also, QED effects to the transition energies are calculated. Further considered dynamical
effects give a possible resolution of the discrepancy of theory and experiment found by recent x-ray free electron laser measurements .
We find 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 and non-linear dynamical effects have to be taken into account. Thus we advocate the use of light-matter interaction models
also valid for strong light fields in the analysis and interpretation of astrophysical and laboratory x-ray spectra.
 N. S. Oreshkina, S. M. Cavaletto, C. H. Keitel and Z. Harman, Phys. Rev. Lett. 113, 143001 (2014).
 S. Bernitt, G. V. Brown, J. K. Rudolph, R. Steinbrügge et al., Nature 492, 225 (2012).