Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 3: Precision spectroscopy of atoms and ions I (with A)
Q 3.8: Talk
Monday, March 17, 2014, 12:15–12:30, BEBEL E42
The mass of the electron — •Florian Köhler1,2,3, Sven Sturm3, Anke Wagner3, Günter Werth4, Wolfgang Quint1,2, and Klaus Blaum3 — 1Fakultät für Physik, Universität Heidelberg — 2GSI Darmstadt — 3Max-Planck-Institut für Kernphysik, Heidelberg — 4Institut für Physik, Johannes Gutenberg-Universität, Mainz
Recently the g-factor experiment for highly charged ions located in Mainz has provided the most stringent bound-state quantum electrodynamics (BS-QED) test [1]. Here, the bound electron g-factor of 28Si13+ has been determined by the Larmor-to-cyclotron frequency ratio and the ion-to-electron mass ratio. For hydrogenlike ions with small nuclear charge, e.g. Z=6, the g-factor can be calculated with parts-per-trillion precision. Experimental improvements [2] enabled the measurement of the Larmor-to-cyclotron frequency ratio with a relative precision of 3 · 10−11 for 12C5+. In combination with theoretical predictions, the atomic mass of the electron has been improved by a factor of 13 with respect to the current CODATA value. This result will directly contribute to ultra-high precision tests of the Standard Model, e.g. the determination of the fine structure constant [3] and future BS-QED tests. In this talk the measurement of the electron mass will be presented and the current status on BS-QED tests will be summarised.
[1] S. Sturm et al., Phys. Rev. Lett. 107, 023002 (2011)
[2] S. Sturm et al., Phys. Rev. Lett. 107, 143003 (2011)
[3] R. Bouchendira et al., Phys. Rev. Lett. 106, 080801 (2011)