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A: Fachverband Atomphysik

A 14: Poster: Precision spectroscopy of atoms and ions (with Q)

A 14.9: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

Absolute energy determination of He-like Krypton K_α transitions — •René Steinbrügge¹, Sven Bernitt¹, Sascha W. Epp², Jan K. Rudolph^1,3, Christian Beilmann⁵, Hendrik Bekker¹, Alfred Müller³, Joachim Ullrich⁶, Oscar O. Versolato¹, Hasan Yavaş⁴, Hans-Christian Wille⁴, and José R. Crespo López-Urrutia¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg — ²MPI für Struktur und Dynamik der Materie, Hamburg — ³Institut für Atom- und Molekülphysik, Gießen — ⁴DESY, Hamburg — ⁵Physikalisches Institut, Heidelberg — ⁶PTB, Braunschweig

Heliumlike ions serve as an important testing ground for investigations of many-body relativistic and QED effects, which scale with the fourth power of the atomic number Z. We have carried out absolute energy measurements of the w (¹S₀ → ¹P₁) and y (¹S₀ → ³P₁) transitions in He-like krypton (Z=36) ions. These were produced and trapped in the transportable electron beam ion trap FLASH-EBIT [1,2], and excited with X-ray photons at PETRA III. The transition energies were measured by scanning a double-crystal monochromator, and detecting fluorescence photons. By using absorption edges for absolute energy calibration we obtain resonance energies of E(w) = 13114.47(14) eV and E(y) = 13026.15(14) eV, which are in excellent agreement with theory, but disagree with earlier, less accurate experiments. Our results largely exclude claims of an anomalous deviation from bound-state QED predictions.

[1] S. W. Epp et al., Phys. Rev. Lett. 98, 183001 (2007)

[2] S. Bernitt et al., Nature 492, 225 (2012)