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          Institute: MPI für Kernphysik     Collection: Precision Spectroscopy and Ultracold Ensembles     Display Documents



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ID: 456478.0, MPI für Kernphysik / Precision Spectroscopy and Ultracold Ensembles
Two-loop QED contributions tests with mid-Z He-like ions
Authors:Kubicek, K.; Bruhns, H.; Braun, J.; Crespo López-Urrutia, J. R.; Ullrich, J.
Language:English
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Journal of Physics: Conference Series
Journal Abbrev.:J. Phys.: Conf. Ser.
Volume (in Journal):163
Sequence Number:012007
Name of Conference/Meeting:14th International Conference on the Physics of Highly Charged Ions (HCI 2008)
Place of Conference/Meeting:Chofu, Tokyo, Japan
(Start) Date of Conference/Meeting
 (YYYY-MM-DD):
2008-09-01
End Date of Conference/Meeting 
 (YYYY-MM-DD):
2008-09-05
Copyright:© Institute of Physics and IOP Publishing Limited 2010.
Review Status:not specified
Audience:Experts Only
Abstract / Description:We report about high-precision wavelength determination of H-like and He-like ions at the Heidelberg Electron Beam Ion Trap (HD-EBIT). The experiment was carried out with a novel flat crystal (Si-111) spectrometer applying a reference technique without collimation. The result for the transition energy of the 1s2p 1P1→ 1s2 1S0 resonance line in He-like S14+ agrees with theoretical predictions with an experimental accuracy five times higher than earlier experiments. The same line in Ar16+ was measured with a relative uncertainty of δλ/λ = 2 × 10-6, a factor of 2.5 more accurate than any X-ray wavelength in highly charged ions ever reported, and for He-like ions probes QED two-electron and two-photon radiative corrections. Beside relative wavelength measurements absolute ones were carried out using the Bond method. The results point at the possibility of establishing absolute Lyman-α1 transition X-ray wavelength standards in the future.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:vogt
Affiliations:MPI für Kernphysik/Group of J. Ullrich/Electron Beam Ion Trap ( J.R. Crespo Lopez-Urrutia)
External Affiliations:Columbia Astrophysics Laboratory, Columbia Universtity, NY, NY 10027-6601, USA
Identifiers:DOI:10.1088/1742-6596/163/1/012007
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