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Q: Fachverband Quantenoptik und Photonik

Q 32: Precision Spectroscopy IV - highly charged ions (joint session A/Q)

Q 32.2: Vortrag

Dienstag, 6. März 2018, 14:30–14:45, K 1.016

X-Ray Spectroscopy of the KLL-Dielectronic Recombination Resonances with a Heidelberg Compact EBIT — •Peter Micke^1,2, Steffen Kühn¹, Jannik Dierks², Thomas Pfeifer¹, Piet O. Schmidt^2,3, Sven Bernitt^1,4, and José R. Crespo López-Urrutia¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ³Leibniz Universität Hannover, Germany — ⁴Friedrich-Schiller-Universität Jena, Germany

The study of highly charged ions is of great interest for atomic, plasma and astrophysics, as well as fusion research. Moreover, their electronic levels include strongly enhanced contributions of special relativity and quantum electrodynamics. We have carried out high-resolution x-ray spectroscopy of the KLL dielectronic recombination resonances of highly charged argon and iron in one of the novel 0.86 T Heidelberg Compact Electron Beam Ion Traps (HC-EBIT). In this resonant process a free electron out of the EBIT’s mono-energetic electron beam is captured into the L-shell of a trapped ion, promoting a second, bound K-shell electron into the L-shell. The excited intermediate state releases a K_α photon during decay, recorded by a high-purity Ge detector. We achieved an excellent electron-energy resolving power of more than 860 together with high relative accuracy for the resonance positions on the order of 50 to 100 meV by using a PTB calibrated high-precision voltage divider. By comparing our results with theoretical values, accurate absolute resonance energies can be deduced and atomic structure theory benchmarked.