2025/05/30 by Morgner, Jonathan, Yerokhin, Vladimir A., Konig, Charlotte M. +9 · 1 citation
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences
paper · doi:10.48550/arxiv.2505.24286
Magnetic moments of bound-electron systems are a sensitive tool for testing fundamental interactions. g factors of lithium-like ions have been rigorously studied in recent years, enabling insights into the relativistic inter-electronic effects. Here, we present the g-factor measurement of lithium-like tin, accurate to 0.5 parts per billion, as well as ab initio theoretical calculations that include an advanced treatment of the inter-electronic interaction. We further improve the prediction by using the experimental result for the hydrogen-like tin g factor, inferring from it the unknown higher-order QED effects. The observed agreement independently confirms the revised theory at a previously inaccessible high nuclear charge Z of 50, where QED effects are significantly larger.