Abstract
Using a phase-detection method to determine the cyclotron frequency of a single trapped ion in a Penning trap allowed us to perform a measurement of the factor of the bound electron in hydrogenlike Si with a statistical uncertainty of . Furthermore, we reevaluated the image-charge shift as the main source of uncertainty. Our result challenges bound-state quantum-electrodynamical calculations by probing two-loop contributions of order (Z) and paves the way towards a more precise determination of fundamental constants as the electron mass.
- Received 30 May 2012
DOI:https://doi.org/10.1103/PhysRevA.87.030501
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