Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Photoionization II

A 8.5: Vortrag

Montag, 14. März 2011, 18:15–18:30, BAR 106

Theory of resonant photoionization of highly charged ions at keV photon energies — •Zoltán Harman1,2, Marius Schütz1, Christoph H. Keitel1, Martin C. Simon1, José R. Crespo López-Urrutia1, Christian Beilmann1, and Joachim Ullrich11Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2ExtreMe Matter Institute EMMI, Planckstrasse 1, 64291 Darmstadt, Germany

Highly charged ions may be further ionized by x-ray radiation, as it happens in, e.g., the warm-hot intergalactic medium. Photoexcitation to an autoionizing state and the subsequent Auger decay gives rise to resonance peaks in photoion or -electron spectra. We calculate cross sections for this process for a variety of ionic systems up to highly charged Fe by means of a fully relativistic distorted wave theory, and compare them to measurements employing an electron beam ion trap and x rays from a synchrotron source (see, e.g., [1]). Understanding photoionization is a prerequisite for the interpretation of a range of astrophysical observations.
M. C. Simon et al., Phys. Rev. Lett. 105, 183001 (2010).

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