Hannover 2013 – scientific programme
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A: Fachverband Atomphysik
A 18: Precision spectroscopy of atoms and ions IV (with Q)
A 18.4: Talk
Tuesday, March 19, 2013, 15:00–15:15, B 305
Absolute energy determination of He-like Krypton Kα transitions — •René Steinbrügge1, Sascha Epp2, Jan Rudolph1,3, Christian Beilmann1, Hendrik Bekker1, Sven Bernitt1, Sita Eberle1, Oscar Versolato1, Hasan Yavas4, Hans-Christian Wille4, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Max Planck Advanced Study Group, CFEL, Hamburg — 3Institut für Atom- und Molekülphysik, Gießen — 4DESY, Hamburg, Germany
Helium-like 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 measurement of the 1s2 − 1s2p transitions in He-like krypton (Z=36) ions. They were produced and trapped at conditions below the electron-impact excitation threshold using the transportable electron beam ion trap FLASH-EBIT [1,2], and excited with X-ray photons at the beamline P01 at PETRA III. The transition energies were measured by scanning the photon energy with the double-crystal monochromator, and detecting fluorescence photons. For absolute energy determinations, we compared measurements at different crystal orientations and calibrations using absorption edges as references. The energy measurements have achieved unprecedented uncertainties well below 5 ppm at 13keV.
[1] S. W. Epp et al., Phys. Rev. Lett. 98, 183001 (2007)
[2] S. Bernitt et al., Nature 492, 225 (2012)