Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Poster: Precision spectroscopy of atoms and ions
A 21.11: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.V
Experimental Setup for Bound-Electron g-Factor Measurements by Double-Resonance Spectroscopy of a Fine Structure Transition — •Marco Wiesel1,2, David von Lindenfels1,2,4, Wolfgang Quint1,2, Manuel Vogel1,3, Alexander Martin1,3, and Gerhard Birkl3 — 1GSI Darmstadt — 2Universität Heidelberg — 3TU Darmstadt — 4MPIK Heidelberg
Magnetic moment measurements of electrons bound in highly charged ions provide access to QED effects in the extreme fields close to the ionic nucleus. Hence a cryogenic Penning trap setup is currently being built to determine the electronic g-factor of boron-like argon (Ar13+) via double-resonance spectroscopy: A closed cycle between the fine structure levels 22 P1/2 - 22 P3/2 is driven by a laser whereas microwaves are tuned to get in resonance with the Zeeman-sublevel transition. With this frequency and the measurement of the cyclotron ion motion the g-factor can be determined with an expected accuracy of 10−9 or better. To this end, we employ an arrangement consisting of a creation trap and a spectroscopy trap. We present an overview of the experiment and give the details and status of the apparatus. In the future, the setup will be connected to the HITRAP beamline at GSI, so hyperfine structure transitions of hydrogen-like heavy ions can be studied and electronic and nuclear magnetic moments can be measured.