Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 4: Precision spectroscopy of atoms and ions I
A 4.8: Vortrag
Montag, 14. März 2011, 15:45–16:00, BAR 205
Bound electron g-Factor Measurement by Double-Resonance Spectroscopy on a Fine-Structure Transition — •David von Lindenfels1,2,3, Wolfgang Quint1,2, Manuel Vogel1, and Gerhard Birkl4 — 1GSI Darmstadt, Germany — 2Universität Heidelberg, Germany — 3MPIK Heidelberg, Germany — 4TU Darmstadt, Germany
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 designed a cryogenic trap assembly with a creation trap and a spectroscopy trap. Argon ions are produced by electron impact ionization and transferred to the spectroscopy trap. We will excite the fine-structure transition 22P1/2 – 22P3/2 with laser radiation and probe microwave transitions between Zeeman sub-levels (laser-microwave double-resonance technique). From this the electronic g-factor gJ can be determined on a ppb level. We have developed and tested a field emission electron source, a novel cryogenic gas valve and an optical setup to detect the low fluorescence signal of the magnetic dipole transition. In 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. The contribution presents techniques and the current status of the experiment.