AI 中文总结
该研究重新评估氢原子1s-2s能量间隔测量中线轮廓不对称性，结合近年理论成果修正相关理论分析，发现观测轮廓不对称会致跃迁频率偏移，与线形模型贡献一致，可依标准不对称轮廓调整。
AI 中文摘要
确定氢原子跃迁频率的实验是最精确的光谱测量之一，在简单原子系统中处于较高水平。氢原子中最持久的测量值是对应于1s-2s双光子跃迁的能量间隔，实验精度达10^-15量级且二十年未变。2011年和2013年的重复实验虽提高了精度，但频率值变化不大。1s-2s跃迁频率对确定里德伯常数和质子电荷半径等物理量至关重要。以往理论研究未揭示显著影响。本文结合近年理论成果，修正了线轮廓不对称性及其对双光子吸收跃迁频率测定影响的理论分析。结果表明，观测轮廓不对称会导致1s-2s跃迁频率在现代实验精度水平上发生偏移，该偏移与构成实验测量误差预算的线形模型贡献一致，可基于近年标准的不对称轮廓进行调整。
英文摘要
Experiments to determine transition frequencies in the hydrogen atom represent some of the most precise spectroscopic measurements and are at a higher level among simple atomic systems. The most persistent measured value in hydrogen is the energy interval corresponding to the $1s-2s$ two-photon transition. The achieved experimental precision is several parts of $10^{-15}$ and has not changed over the last two decades. Although repeated experiments in 2011 and 2013 have improved the accuracy by several times, the frequency value has not changed significantly. On this basis, the frequency of the $1s-2s$ transition holds pivotal for determining physical quantities such as the Rydberg constant and the proton charge radius. Theoretical efforts to study in detail the effects that might influence such precise measurements have not revealed significant contributions. The present work revises the theoretical analysis of the line contour asymmetry and its influence on the determination of the two-photon absorption transition frequency, taking into account the theoretical achievements of recent years in this direction. It is shown that the asymmetry of the observed profile can lead to a $1s-2s$ transition frequency shift at the level of modern experimental accuracy. The found frequency shift is consistent with the line shape model contribution that forms the error budget of the experimental measurements. Adjustment can be carried out on the basis of the asymmetric profile that has become standard in recent years.
Journal refPhys. Rev. A 114, 012821, 2026
