Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Poster: Precision spectroscopy of atoms and ions (with Q)

A 35.27: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Investigations of the hyperfine interaction in Ti-like bismuth — •Michael A. Blessenohl, Hendrik Bekker, Alexander Windberger, and José R. Crespo López-Urrutia — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

The ground state configuration [Ar] 3d4 of titanium-like ions split into 34 different levels that feature a J=2 → 3 magnetic dipole transition in the optical regime for a broad range of atomic numbers Z. This allows for very accurate measurements of the quantum electrodynamical (QED) corrections of the electron potential in atoms. Predictions made with the Flexible Atomic Code (FAC) place the transition at 340.6 nm for the Bi61+ ion. We plan to present first results of high-resolution measurements of this transition at the Heidelberg electron beam ion trap (HD-EBIT) using a Czerny-Turner type spectrometer equipped with a cooled CCD camera. Due to the large magnetic moment of the bismuth nucleus a prominent hyperfine splitting is expected to appear, enabling us to probe nuclear size effects in a regime where the hyperfine structure (HFS) splitting is of a magnitude similar to the strong magnetic field of an EBIT, and the QED relative contributions to the transition energy are extremely large.

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