Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster I

A 8.30: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

High precision wavelength measurements of X-ray Li- and Be-like Fe satellite lines — •Katharina Kubiček, José R. Crespo López-Urrutia, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

We report on high precision wavelength measurements of dielectronic satellite lines in Li- and Be-like iron excited through resonant electron capture by the monoenergetic electron beam of the FLASH-EBIT. A advanced flat crystal x-ray spectrometer was used while stepwise varying the beam energy. Whereas conventional experiments on dielectronic recombination focus on high electron beam energy resolution, and provide only poor photon energy resolving powers of about E/ΔE=50, in this configuration transition energies are measured with a value E/ΔE= 2000 by determining absolute Bragg angles without the need of reference lines. Estimated experimental uncertainties of Δ E < 18  meV allow to probe QED contributions of some few eV to transition energies with high sensitivity.