Testing inter-electronic interaction in lithium-like tin
Abstract
Magnetic moments of bound-electron systems are a sensitive tool for testing fundamental interactions. factors of lithium-like ions have been rigorously studied in recent years, enabling insights into the relativistic inter-electronic effects. Here, we present the -factor measurement of lithium-like tin, accurate to 0.5 parts per billion, as well as \textit{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 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 of 50, where QED effects are significantly larger.
Keywords
Cite
@article{arxiv.2505.24286,
title = {Testing inter-electronic interaction in lithium-like tin},
author = {Jonathan Morgner and Vladimir A. Yerokhin and Charlotte M. Konig and Fabian Heiße and Bingsheng Tu and Tim Sailer and Bastian Sikora and Zoltán Harman and Jose R. Crespo López-Urrutia and Christoph H. Keitel and Sven Sturm and Klaus Blaum},
journal= {arXiv preprint arXiv:2505.24286},
year = {2025}
}