Berlin 2014 – wissenschaftliches Programm
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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 Kα transitions — •René Steinbrügge1, Sven Bernitt1, Sascha W. Epp2, Jan K. Rudolph1,3, 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)