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  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. (2013). A step toward probing higher-order Feynman diagrams in few-electron highly charged ions. Physica Scripta, T156: 014005.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-36D1-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-CBB0-2
Genre: Conference Paper

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 Creators:
Kubicek, K.1, Author              
Mokler, P. H., Author
Ullrich , J., Author
Lopez-Urrutia, J. R. C., Author
Affiliations:
1Research Group of Structural Dynamics of (Bio)chemical Systems, MPI for biophysical chemistry, Max Planck Society, ou_578564              

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 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.

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Language(s): eng - English
 Dates: 2013-09
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
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Title: 16th International Conference on the Physics of Highly Charged Ions (HCI)
Place of Event: Heidelberg/Germany
Start-/End Date: 2012-09-02 - 2012-09-07

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Title: Physica Scripta
Source Genre: Journal
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Pages: - Volume / Issue: T156 Sequence Number: 014005 Start / End Page: - Identifier: -