High-precision determination of g factors and masses of ²⁰Ne⁹⁺ and ²²Ne⁹⁺

2023/10/17 by Heiße, F., Door, M., Sailer, T. +13
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2310.11119

Abstract

We present the measurements of individual bound electron g factors of ²⁰Ne⁹⁺ and ²²Ne⁹⁺ 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(²⁰Ne)=19.992 440 168 77 (9) u, which improves the current literature value by a factor of nineteen, 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=5.485 799 090 99 (59) × 10^-4 u as well as a factor of eight improved m(²²Ne)=21.991 385 098 2 (26) u.

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