High-Precision Determination of g Factors and Masses of 20Ne9+ and 22Ne9+

Abstract:

We present the measurements of individual bound electron $g$ factors of ${20\mathrm{Ne}}^{9+}$ and ${22\mathrm{Ne}}^{9+}$ on the relative level of 0.1 parts per billion. The comparison with theory represents the most stringent test of bound-state QED in strong electric fields. A dedicated mass measurement results in $m\left(20\mathrm{Ne}\right)=19.99244016877\left(9\right)u$, which improves the current literature value by a factor of 18, disagrees by 4 standard deviations, and represents the most precisely measured mass value in atomic mass units. Together, these measurements yield an electron mass on the relative level of 0.1 ppb with $m_e=5.48579909099\left(59\right)\times {10}^{-4}u$ as well as a factor of seven improved $m\left(22\mathrm{Ne}\right)=21.9913850982\left(26\right)u$.

F. Heiße, M. Door, T. Sailer, P. Filianin, J. Herkenhoff, C. M. König, K. Kromer, D. Lange,
J. Morgner, A. Rischka, Ch. Schweiger, B. Tu, Y. N. Novikov, S. Eliseev, S. Sturm, K. Blaum, „High-Precision Determination of g Factors and Masses of 20Ne9+ and 22Ne9+“, Phys. Rev.Lett. 131, 253002 (2023).

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.253002

Related to Project B01