Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Precision spectroscopy of atoms and ions (with Q)

A 30.19: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Resonant excitation of the 136 eV 2s-2p transition in Li-like Kr³³⁺ at FLASH — •Sven Bernitt^1,2, Günter Brenner³, René Steinbrügge¹, Stepan Dobrodey¹, Michael A. Blessenohl¹, André Cieluch¹, Zachary Hockenbery¹, Steffen Kühn¹, Janko Nauta¹, Miguel-Angel Sanchez¹, Sascha W. Epp⁴, and José R. Crespo López-Urrutia¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²IOQ, Friedrich-Schiller-Universität, Jena, Germany — ³DESY, Hamburg, Germany — ⁴Max-Planck-Institut für Struktur und Dynamik der Materie, Hamburg, Germany

We use the transportable electron beam ion trap FLASH-EBIT to provide a target of Li-like Kr³³⁺ for monochromatized VUV light from the the free-electron laser FLASH. By detecting resonantly excited fluorescence as a function of the photon energy, we were able to perform high precision spectroscopic studies of the 1s²2s-1s²2p transition at 136 eV. We reached an accuracy of 6 meV, providing an improvement by a factor of 7 over previous measurements. These results serve as a benchmark for atomic theory and help with the interpretation of VUV spectra from astrophysical and laboratory plasmas. Future work aims at investigations of nuclear size effects which currently impede the full analysis of QED experimental data of H-like systems.