Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision spectroscopy of atoms and ions (with Q)
A 30.13: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Investigations of nuclear effects in highly charged ions — •Hendrik Bekker1, Sebastian Kebrich1, Kathrin Kromer1, Andrey V. Volotka2, Zoltán Harman1, Christoph H. Keitel1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Helmholtz-Institut Jena
Treatment of the interaction between electrons and nucleus beyond the point-like Coulomb potential approximation leads to modification of the energy level structure of bound electrons. Nuclear properties such as its spin, magnetic moment, charge and magnetization distributions can be investigated by measuring how they affect the electronic structure of atoms and ions. Highly charged ions (HCI) belonging to the H-like isoelectronic sequence are specially suitable for this. We aim to measure the hyperfine splitting of the 2S1/2, F = 3−2 ground state in H-like Pr58+, which is predicted to be at approximately 847 nm.
We use the Heidelberg electron beam ion trap to produce, trap, and collisionally excite HCI. Fluorescence light in the optical domain is measured using a grating spectrometer with which a precision of 1 ppm can be reached. Using this setup we have also measured the J = 2−3 transition in the 3d4 ground term of Ti-like Pr37+ and Re53+. The many hyperfine levels and the strong magnetic field at the trap center give rise to a complex line shape, which is accurately reproduced by theory. Additionally, we have investigated the KLL dielectronic recombination in He- to O-like Pr, which is an important tool for trap optimization. Current efforts are towards the efficient production and trapping of H-like Pr58+.