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

ID: 508169.0, MPI für Kernphysik / Precision Spectroscopy and Ultracold Ensembles
X-ray laser spectroscopy of highly charged ions at FLASH
Authors:Epp, S. W.; Crespo López-Urrutia, J. R.; Simon, M. C.; Baumann, T.; Brenner, G.; Ginzel, R.; Guerassimova, N.; Mäckel, V.; Mokler, P. H.; Schmitt, B. L.; Tawara, H.; Ullrich, J.
Date of Publication (YYYY-MM-DD):2010-09-06
Title of Journal:Journal of Physics B: Atomic, Molecular and Optical Physics
Journal Abbrev.:J. Phys. B: At. Mol. Opt. Phys.
Issue / Number:19
Start Page:1
End Page:17
Sequence Number of Article:194008
Copyright:© IOP Publishing 2010
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Laser spectroscopy, widely applied in physics and chemistry, is extended into the soft x-ray region for the first time. Resonant fluorescence excitation of highly charged ions (HCIs) by soft x-ray free-electron lasers (FELs) shows here the potential for unprecedented precision on photonic transitions hitherto out of reach. The novel experiments combine an electron beam ion trap (EBIT) with the Free-electron LASer at Hamburg (FLASH) to measure resonant fluorescence by trapped HCIs as a function of the laser's wavelength. The present experiments have already reached the performance of conventional soft and hard x-ray spectroscopy. We present the results obtained for three fundamental and theoretically challenging transitions in Li-like ions, namely 1s22s 2S1/2–1s22p 2P1/2 in Fe23+ at 48.6 eV, in Cu26+ at 55.2 eV and 1s22s 2S1/2–1s22p 2P3/2 in Fe23+ at 65.3 eV. The latter demonstrates laser spectroscopy of multiply or HCIs at more than one order of magnitude higher energies than hitherto reported. Resolving power leading to relative precision up to 6 parts-per-million points to the possibility of providing an atomic absolute wavelength standard in this spectral region, which is still lacking.
Classification / Thesaurus:32.30.Rj X-ray spectra 12.20.-m Quantum electrodynamics
External Publication Status:published
Document Type:Article
Communicated by:vogt
Affiliations:MPI für Kernphysik/Group of J. Ullrich/Electron Beam Ion Trap ( J.R. Crespo Lopez-Urrutia)
External Affiliations:Max Planck Advanced Study Group at CFEL, D-22761 Hamburg, Germany
HASYLAB, Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany
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