3 papers
physics.atom-ph2025
Precise ab initio calculations of He() fine structure of high Rydberg states
Hao Fang, Jing Chi, Xiao-Qiu Qi +3
High-precision measurements of the fine-structure splittings in helium high Rydberg states have been reported, yet corresponding ab initio benchmarks for direct comparison remain u…
physics.atom-ph2024
Revised He nuclear charge radius due to electronic hyperfine mixing
Xiao-Qiu Qi, Pei-Pei Zhang, Zong-Chao Yan +4
The significant discrepancy in the difference of squared nuclear charge radii of He obtained from electronic-atom or muonic-atom energy levels is a puzzle. In this p…
physics.atom-ph2024
A Simple approach for precision calculation of Bethe logarithm
San-Jiang Yang, Jing Chi, Wan-Ping Zhou +4
In this article we propose a simple approach for the precision calculation of Bethe logarithm. The leading contributions are obtained using specific operators, while the remaining…