Abstract
We present an experimental value for the factor of the electron bound in hydrogenlike oxygen, which is found to be . The experiment was performed on a single ion stored in a Penning trap. For the first time, the expected line shape of the -factor resonance is calculated which is essential for minimizing the systematic uncertainties. The measurement agrees within with the predicted theoretical value . It represents a stringent test of bound-state quantum electrodynamics to a 0.25% level. Assuming the validity of the underlying theory, a value for the electron mass is obtained: . This value agrees with our earlier determination on and allows a combination of both values which is about 4 times more precise than the currently accepted one.
- Received 11 September 2003
DOI:https://doi.org/10.1103/PhysRevLett.92.093002
©2004 American Physical Society