Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 52: Precision Spectroscopy of Atoms and Ions III (with A)

Q 52.5: Talk

Thursday, March 26, 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 [1]. 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 [2]. 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.
[1] N. S. Oreshkina, S. M. Cavaletto, C. H. Keitel and Z. Harman, Phys. Rev. Lett. 113, 143001 (2014).
[2] S. Bernitt, G. V. Brown, J. K. Rudolph, R. Steinbrügge et al., Nature 492, 225 (2012).