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A: Fachverband Atomphysik
A 27: Poster: Photoionization
A 27.1: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Radiative and Auger widths of X-ray K-shell excited few-electron iron ions — •René Steinbrügge1, Sven Bernitt1, Sascha W. Epp2, Jan K. Rudolph1,3, 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 gives rich information of the dynamics of outflows in X-ray binary stars and active galactic nuclei. Very high X-ray fluxes in the vicinity of such objects produce and drive mainly photoionized plasmas, but up to now it was not possible to investigate the underlying photoionisation processes in the laboratory. We present the first measurement of radiative and Auger rates for K-shell transitions in Li-like, Be-like, and 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. We observe photoionization by detecting the changes in the ionic charge state. By taking ratios of the photoionization yield and the simultaneous recorded fluorescence, we suppress setup-dependent uncertainties. Together with the total linewidths [1], this allows us to determine absolute values for the radiative and Auger widths.
[1] J. K. Rudolph et al., Phys. Rev. Lett. 111, 103002 (2013)