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A: Fachverband Atomphysik

A 8: Poster: Photoionization

A 8.3: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Radiative and Auger transition rates of K-shell excited few-electron iron ions — •René Steinbrügge¹, Sven Bernitt¹, Sascha W. Epp², Jan K. Rudolph^1,3, Christian Beilmann⁵, Hendrik Bekker¹, Sita Eberle¹, Alfred Müller³, Joachim Ullrich⁶, Oscar O. Versolato¹, Hasan Yavaş⁴, Hans-Christian Wille⁴, and José R. Crespo López-Urrutia¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg — ²Max-Planck-Institut für Struktur und Dynamik der Materie, Hamburg — ³Institut für Atom- und Molekülphysik, Gießen — ⁴DESY, Hamburg — ⁵Physikalisches Institut, Heidelberg — ⁶PTB, Braunschweig

The spectrum of highly charged iron ions provides rich information about the dynamics in X-ray binary stars and active galactic nuclei. To model measured spectra, a precise knowledge of the transition rates is needed. We present a measurement of radiative and Auger rates for K-shell transitions in Li-like to C-like iron ions. These were produced and trapped in the transportable electron beam ion trap FLASH-EBIT and resonantly excited with X-ray photons at PETRA III. By taking ratios of the photoionization yield and the simultaneous recorded fluorescence, we suppress setup-dependent uncertainties. Together with natural line widths [1], this allows us to determine absolute values for the radiative and Auger transition rates, with a better-than-10 % accuracy in the Li-like system. Furthermore, by analyzing the angular distribution of the fluorescence photons, we resolved different radiative decay channels in the Be-like and C-like system.

[1] J. K. Rudolph et al., Phys. Rev. Lett. 111, 103002 (2013)