《科学》（20250529出版）一周论文导读

▲ 作者：Jonathan Morgner, Vladimir A. Yerokhin et al.

▲ 链接：

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

▲ 摘要：

束缚电子体系的磁矩是检验基本相互作用的灵敏探针。近年来，类锂离子的精确研究为相对论性电子间效应提供了新见解。

在这项研究中，我们报道了精度达0.5 ppb的类锂锡离子g因子测量结果，以及包含电子间相互作用高级处理方法的从头算理论计算。通过结合类氢锡离子g因子的实验结果，我们进一步优化了理论预测，由此推演出未知的高阶量子电动力学（QED）效应。

在原子序数Z=50的高核电荷体系中该区域QED效应显著增强，观测与理论的高度吻合首次独立验证了修正理论模型的正确性。

▲ 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.

生物学 Biology