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

ID: 268549.0, MPI für Kernphysik / Precision Spectroscopy and Ultracold Ensembles
High-precision measurements in few-electron highly charged ions at the Heidelberg Electron Beam Ion Trap (EBIT)
Authors:Crespo López-Urrutia, J. R.; Braun, J.; Brenner, G.; Bruhns, H.; Draganic, I. N.; González Martínez, A. J.; Lapierre, A.; Mironov, V.; Osborne, C.; Sikler, G.; Soria Orts, R.; Tawara, H.; Ullrich, J.; Tupitsyn, I. I.; Shabaev, V. M.
Date of Publication (YYYY-MM-DD):2005-04-01
Title of Journal:Canadian Journal of Physics
Journal Abbrev.:Can. J. Phys.
Issue / Number:4
Start Page:387
End Page:393
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The research program at the Heidelberg Electron Beam Ion Trap (EBIT) has concentrated mainly on precision measurements relevant to quantum electrodynamics (QED) and nuclear physics. Spectroscopic measurements in the optical region have delivered the most accurate wavelengths ever reported for highly charged ions, extracting even isotopic shifts. The forbidden transitions of B-like Ar XIV and Be-like Ar XV ions were studied. They are especially interesting, since the QED contributions are as large as 0.2%. Improved atomic structure calculations allowed for the determination of their values with growing accuracy. The lifetimes of the corresponding metastable levels have also been measured with an uncertainty of less than 0.5% thus becoming sensitive to the influence of the bound electron anomalous magnetic moment, so far an almost experimentally unexplored QED effect. A new laser spectroscopic setup aims at facilitating future studies of the hyperfine structure of heavy hydrogenic ions. Through the study of the dielectronic recombination, information on rare processes, such as two-electron-one-photon transitions in Ar16+, or the interference effects between dielectronic and radiative recombination in Hg77+, and accurate values for the excitation energies of very heavy HCI have been obtained. A novel X-ray crystal spectrometer allowing absolute X-ray wavelength measurements in the range up to 15 keV with very high precision and reproducibility is currently used to study the Lyman series of H-like ions of medium-Z ions and the 2s–2p transitions of very heavy Li-like ions.
Classification / Thesaurus:31.30.Jv, 32.80.Fb, 32.80.Dz, 32.30.Jv, 32.30.Rj, 95.30.Dr
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group J. Ullrich/Electron Beam Ion Trap ( J.R. Crespo Lopez-Urrutia)
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