Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 16: Photoionization

A 16.2: Vortrag

Dienstag, 19. März 2013, 11:15–11:30, F 428

Coronium & friends: High-precision calculation of the structure of astrophysically relevant Fe ions — •Natalia S. Oreshkina¹, Zoltán Harman^1,2, and Christoph H. Keitel¹ — ¹Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany — ²ExtreMe Matter Institute (EMMI), Planckstrasse 1, 64291 Darmstadt, Germany

The dynamics of astrophysical objects, such as coronal plasmas, stellar winds, outflows, and accretion disks can be studied using the Doppler shifts and widths of emission lines of highly charged Fe ions, recorded by space observatories. High-precision calculations of these systems may be important for astrophysical research: as an example, velocities of astrophysical objects relative to the observer may be determined once the frequency in the emitter (ionic) frame is well known from theoretical calculations or from photoionization (or photoexcitation) experiments.

In the talk, accurate calculations of the visible and x-ray transition energies in highly charged ₂₆⁵⁶Fe¹³⁺ to ₂₆⁵⁶Fe¹⁶⁺ ions are presented. Relativistic electron correlation calculations are performed within the framework of the configuration interaction method with Dirac-Fock-Sturmian basis functions. For the 3p_3/2 → 3p_1/2 green magnetic dipole transition in ₂₆⁵⁶Fe¹³⁺, we take into account quantum electrodymanic effects by employing an effective screening potential. The results are compared to electron beam ion trap measurements.