Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 10: Precision Spectroscopy of Atoms and Ions I

A 10.7: Talk

Wednesday, March 10, 2010, 12:15–12:30, F 107

Bound electron g-Factor Measurement by Double-Resonance Spectroscopy on a Fine-Structure Transition — •David von Lindenfels^1,2, Nicolaas P. M. Brantjes^1,2, Wolfgang Quint^1,2, and Manuel Vogel^1,3 — ¹GSI Darmstadt, Germany — ²Universität Heidelberg, Germany — ³Imperial College, London, UK

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. We designed a cryogenic trap assembly with a creation trap and a spectroscopy trap — a half-open compensated cylindrical Penning trap. Argon ions are produced by electron impact ionization and transferred to the spectroscopy trap. We will excite the fine-structure transition 2²P_1/2 – 2²P_3/2 with laser radiation and probe microwave transitions between Zeeman sub-levels (laser-microwave double-resonance technique). From this the electronic g-factor g_J can be determined on a ppb level. Thus, the experiment allows to test QED predictions with high accuracy. 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 talk presents techniques and the current status of the experiment.