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SYUF: Ultra-fast Dynamics in FEL Light Pulses

SYUF 1: SYUF I

SYUF 1.3: Hauptvortrag

Mittwoch, 4. März 2009, 15:00–15:30, VMP 8 HS

Spectroscopy of Highly Charged Ions with Free Electron Lasers — •Sascha Epp1, Martin Simon2, Thomas Baumann2, Günter Brenner2, Volkhard Mäckel2, Paul Mokler2, Hiro Tawara2, Natalia Guerassimova3, Evgeny Schneidmiller3, Rolf Treusch3, José Crespo Lopéz Urrutia2, and Joachim Ullrich21Max Planck Advanced Study Group at CFEL, 22603 Hamburg, Germany — 2Max-Planck-Institute für Kernphysik, 69117 Heidelberg, Germany — 3DESY, 22603 Hamburg, Germany

Resonant laser spectroscopy of soft x-ray transitions in highly charged ions (HCIs) by means of Free Electron Lasers (FELs) has been proven to be a promising technique with the potential for unprecedented precision on energetic transitions unreachable by traditional laser spectroscopy. The technique relies on combining a state-of-the-art EBIT with a FEL (like FLASH), measuring the resonant fluorescence yield by the trapped HCIs after their excitation as a function of the wavelength of the FLASH-light. Three fundamental transitions at energies E0 were investigated, namely 1s22s 2S1/2–1s22p 2P1/2 in Li-like Fe23+ at 48.6 eV, Li-like Cu27+ at 55.2 eV, and 1s22s 2S1/2–1s22p 2P3/2 in Fe23+ at 65.3 eV. The latter demonstrates resonant laser spectroscopy of multiply or highly charged ions at more than one order of magnitude higher transition energies as reported elsewhere. We attain presently a resolution of E0/FWHM=2500 for the individual spectral lines, resulting in a relative precisions of 8 parts-per-million (ppm) for the determination of the center-of-mass wavelength per hour of beamtime.

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DPG-Physik > DPG-Verhandlungen > 2009 > Hamburg