德国马克斯普朗克核物理研究所Klaus Blaum团队测试了类锂锡中电子间相互作用。2025年5月29日出版的《科学》杂志发表了这项成果。

束缚电子系统的磁矩是测试基本相互作用的敏感工具。近年来，类锂离子的g因子得到了严格的研究，使人们能够深入了解相对论性电子间效应。在这项工作中，研究组提出了类锂锡的g因子测量，精确到十亿分之0.5，以及从头计算理论计算，其中包括对电子间相互作用的高级处理。 

研究组利用类氢锡因子的实验结果进一步改进了预测，从中推断出未知的高阶量子电动力学（QED）效应。观察到的一致性独立地证实了先前无法达到的高原子序数Z为50的修正理论，其中QED效应要大得多。

附：英文原文

Title: Testing interelectronic interaction in lithium-like tin

Author: Jonathan Morgner, Vladimir A. Yerokhin, Charlotte M. Knig, Fabian Heie, Bingsheng Tu, Tim Sailer, Bastian Sikora, Zoltán Harman, José R. Crespo López-Urrutia, Christoph H. Keitel, Sven Sturm, Klaus Blaum

Issue&Volume: 2025-05-29

Abstract: Magnetic moments of bound-electron systems are a sensitive tool for testing fundamental interactions. The g factors of lithium-like ions have been rigorously studied in recent years, enabling insights into the relativistic interelectronic effects. In this work, 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 interelectronic interaction. We further improved the prediction by using the experimental result for the hydrogen-like tin g factor, inferring from it the unknown higher-order quantum electrodynamic (QED) effects. The observed agreement independently confirms the revised theory at a previously inaccessible high atomic number Z of 50, where QED effects are considerably larger.

DOI: adn5981

Source: https://www.science.org/doi/10.1126/science.adn5981