Datensatz

Zusammenfassung

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 g factor of the bound electron in hydrogenlike ²⁸Si¹³⁺ with a statistical uncertainty of 4×10⁻¹¹. 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 (Zα) ⁶ and paves the way towards a more precise determination of fundamental constants as the electron mass.