6533b85afe1ef96bd12b9e53

RESEARCH PRODUCT

ElectronicgFactor of Hydrogenlike OxygenO7+16

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We present an experimental value for the $g$ factor of the electron bound in hydrogenlike oxygen, which is found to be ${g}_{\mathrm{e}\mathrm{x}\mathrm{p}\mathrm{t}}=2.000\text{ }047\text{ }025\text{ }4\text{ }(15)(44)$. The experiment was performed on a single $^{16}\mathrm{O}^{7+}$ ion stored in a Penning trap. For the first time, the expected line shape of the $g$-factor resonance is calculated which is essential for minimizing the systematic uncertainties. The measurement agrees within $1.1\text{ }\ensuremath{\sigma}$ with the predicted theoretical value ${g}_{\mathrm{t}\mathrm{h}\mathrm{e}\mathrm{o}\mathrm{r}\mathrm{y}}=2.000\text{ }047\text{ }020\text{ }2\text{ }(6)$. 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: ${m}_{e}=0.000\text{ }548\text{ }579\text{ }909\text{ }6\text{ }(4)\text{ }\mathrm{u}$. This value agrees with our earlier determination on $^{12}{\mathrm{C}}^{\mathrm{5}\mathrm{+}}$ and allows a combination of both values which is about 4 times more precise than the currently accepted one.