A step toward probing higher-order Feynman diagrams in few-electron highly 
charged ions.

Kubicek, K.; Mokler, P. H.; Ullrich , J.; Lopez-Urrutia, J. R. C.

doi:10.1088/0031-8949/2013/T156/014005

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A step toward probing higher-order Feynman diagrams in few-electron highly charged ions.

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Kubicek, K.
Research Group of Structural Dynamics of (Bio)chemical Systems, MPI for biophysical chemistry, Max Planck Society;

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Citation

Kubicek, K., Mokler, P. H., Ullrich, J., & Lopez-Urrutia, J. R. C. (2013). A step toward probing higher-order Feynman diagrams in few-electron highly charged ions. Physica Scripta, T156: 014005.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-36D1-4

Abstract

The Lamb shift in medium-heavy H-like and He-like ions has been determined with unprecedented accuracy with a novel x-ray spectroscopy technique. Absolute wavelength measurements of emission lines from trapped highly charged Ar ions thereby achieved uncertainties down to the range of 1.6-2.4 ppm. For the H-like ion Ar17+, the ground state Lamb shift is determined with a 0.4% accuracy, thus excellently confirming quantum electrodynamics (QED) calculations and therefore the hitherto implied suitability of lines from these ionic species as absolute and accurate standards in the x-ray region. Second-order QED terms, i.e. two-electron terms, are also probed for the He-like species Ar16+. Deviations from QED predictions that have recently been claimed are excluded with high significance by the present results.