Hamburg 2009 – wissenschaftliches Programm

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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 Ullrich² — ¹Max 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 ²S_1/2–1s²2p ²P_1/2 in Li-like Fe²³⁺ at 48.6 eV, Li-like Cu²⁷⁺ at 55.2 eV, and 1s²2s ²S_1/2–1s²2p ²P_3/2 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.