Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 11: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)

A 11.7: Talk

Tuesday, March 12, 2024, 12:30–12:45, HS 1098

X-Ray Spectroscopy of the Kα transitions in He-like Uranium — •Philip Pfäfflein^1,2,3, Steffen Allgeier⁴, Sonja Bernitt^1,2,3, Andreas Fleischmann⁴, Marvin Friedrich⁴, Alexandre Gumberidze², Christoph Hahn^1,2, Daniel Hengstler⁴, Marc O. Herdrich^1,2,3, Felix Kröger^1,2,3, Patricia Kuntz⁴, Michael Lestinsky², Bastian Löher², Esther B. Menz^1,2,3, Uwe Spillmann², Sergiy Trotsenko^1,2, Günter Weber^1,2, Binghui Zhu^1,2,3, Christian Enss⁴, and Thomas Stöhlker^1,2,3 — ¹HI Jena, Germany — ²GSI, Darmstadt, Germany — ³Jena University, Germany — ⁴Heidelberg University, Germany

Helium-like ions are the simplest atomic multi-body systems. Their study along the isoelectronic sequence allows for precision tests of the interplay of the effects of electron–electron correlation, relativity and quantum electrodynamics (QED) within a wide range of electromagnetic field strengths. Heavy highly charged ions are ideal for probing higher order QED terms. For the 1s state in uranium, e.g. their contributions are on the 1 eV level at binding energies of above 100 keV.

In spring 2021 an X-ray spectroscopy study of helium-like uranium ions has been performed at the electron cooler of the low-energy storage ring CRYRING@ESR at GSI, Darmstadt using metallic magnetic calorimeter detectors. The achieved spectral resolution reveals the substructure of the Kα₁ and Kα₂ lines for the first time. Using two detectors the Doppler shift was deduced from the recorded spectra. This breakthrough in X-ray spectroscopy enables future precision tests of bound-state QED and many-body effects in extreme field strengths.