Stuttgart 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 36: Precision spectroscopy of atoms and ions III
A 36.3: Vortrag
Donnerstag, 15. März 2012, 14:30–14:45, V47.03
Bound-electron g-factor measurement by double-resonance spectroscopy of a fine-structure transition — •David von Lindenfels1,2,3, Marco Wiesel1,2, Wolfgang Quint1,2, Manuel Vogel1,4, Alexander Martin1,4, and Gerhard Birkl4 — 1GSI Darmstadt — 2Universität Heidelberg — 3MPIK Heidelberg — 4TU Darmstadt
The precise determination of bound-electron g-factors in highly-charged ions (e.g. boron-like argon Ar13+ and calcium Ca15+) provides a stringent test of bound-state QED in extreme fields and contributes to the determination of fundamental constants. We have prepared a cryogenic Penning trap that features interaction of ions with electromagnetic fields in the static (DC), radio frequency, microwave, and visible regime. We will excite the fine-structure transition 22P1/2 – 22P3/2 with laser radiation and probe microwave transitions between Zeeman sub-levels (in a laser-microwave double-resonance technique). The ion cyclotron resonance measures the static magnetic field. From this the electronic g-factor gJ can be determined on a parts-per-billion level of accuracy. The experiment is currently being set up for measurements with medium heavy ions, which we produce inside the trap vacuum chamber. In the future, the trap will be connected to the HITRAP beamline at GSI, and the method will be applied to hyperfine-structure transitions of hydrogen-like heavy ions in order to measure electronic and nuclear magnetic moments. In this contribution, we present the physics background, the measurement principle, and the current status of the experiment.