ARTEMIS (g-Factor Measurements)

Mainz/GSI Precision Trap for g-Factor Measurements


This experiment is currently being set up at GSI. It focuses on precise measurements of magnetic moments and transition wavelength of forbidden transitions in highly charged ions. The measurement principle is a newly developed laser-microwave double-resonance technique which uses fluorescence light from an optical transition (in the fine or hyperfine structure) as a probe for microwave excitation between corresponding Zeeman sublevels. The energy of the microwave transitions directly yields the gF factor of the ion. A combined measurement of atomic gF factors on the ppb level of accuracy and of the HFS transition frequency allows a simultaneous and independent determination of the electronic gJ factor and the nuclear gI factor. For the first time, precise values for nuclear magnetic moments can be inferred without the use of diamagnetic corrections which currently limits the achievable accuracy substantially. At the same time, diamagnetic shielding effects can for the first time be quantified in a spectroscopic measurement. This information may be used to benchmark corresponding theories. The proposed measurements furthermore allow stringent tests of theoretical values for g factors as calculated in the framework of quantum electrodynamics of bound states.

Recent publications of relevance:

  1. "A laser-microwave double resonance experiment for precise g-factor determinations in highly charged ions", W. Quint, D. Moskovkin, V.M. Shabaev and M. Vogel, Phys. Rev. A 78 (2008) 032517
  2. "Experimental access to higher-order Zeeman e ffects by precision spectroscopy of highly charged ions in a Penning trap" D. von Lindenfels, M. Wiesel, W. Quint, D. Glazov, V.M. Shabaev, G. Birkl and M. Vogel, Phys. Rev. A 87 023412 (2013)
  3. "Aspects of Fundamental Physics in Precision Spectroscopy of Highly Charged Ions in Penning Traps", M. Vogel and W. Quint, Annalen der Physik 525 (2013) 505
  4. "Superconducting radio-frequency resonator in magnetic elds up to 6 Tesla", M.S. Ebrahimi, N. Stallkamp, W. Quint, M. Wiesel, M. Vogel, A. Martin, and G. Birkl, Rev. Sci. Inst. 87 075110 (2016)
  5. "Experiments for high-precision measurements of the bound electron's magnetic moment", S. Sturm, M. Vogel, F. Köhler, W. Quint and K. Blaum, Atoms 5 (2017) 4
  6. "Optically transparent solid electrodes for precision Penning traps", M. Wiesel, G. Birkl, M.S. Ebrahimi, A. Martin, W. Quint, N. Stallkamp, and M. Vogel, Rev. Sci. Inst. 88, 123101 (2017);
  7. "Resistive cooling of highly charged ions in a Penning trap to a fluid-like state", M.S. Ebrahimi, Z. Guo, M. Wiesel, G. Birkl, W. Quint and M. Vogel, Phys. Rev. A 98, 023423 (2018)
  8. "Electron Magnetic Moment in Highly Charged Ions: The ARTEMIS Experiment", M. Vogel, M.S. Ebrahimi, Z. Guo, A.  Khodaparast, G. Birkl and W. Quint, Annalen der Physik (Berlin) 1800211 (2018)