Microwave spectroscopy of positronium atoms in free space

Microwave spectroscopy of positronium atoms in free space
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自由空间中正电子原子的微波光谱

DOI:
10.1103/physreva.107.042810
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发表时间:
2023
期刊:
影响因子:
2.9
通讯作者:
Sheldon R
Sheldon R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sheldon R

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我们报道了用喇叭天线产生的微波辐射照射在自由空间中移动的原子的正电子(Ps)间隔的测量结果。以前使用波导中的原子进行的这种转变的测量,显示出不对称和移位的线形。在我们这里报告的自由空间测量中,观察到了小得多的线形不对称性,但具有随喇叭天线方向变化的大的频移。我们的观测得到了线形模拟的支持,并证明了微波辐射场分布的变化可以扰动测量的线形,引起表观频率漂移,而不一定会引起很大的不对称;这种效应可以解释以前的测量结果,其中观察到的明显与量子电动力学的预测不一致[L.Gurung,T.J.Babij,S.D.Hogan和D.B.Cassidy,Phys。莱特牧师。125,073002(2020)0031-900710.1103/PhysRevLett.125.073002].
We report measurements of the positronium (Ps)interval in which atoms traveling in free space were irradiated with microwave radiation generated using a horn antenna. Previous measurements of this transition, performed using atoms in waveguides, exhibited asymmetric and shifted line shapes. In the free-space measurements we report here, much smaller line-shape asymmetry was observed, but with large frequency shifts that varied with the orientation of the horn antenna. Our observations are supported by line-shape simulations and demonstrate that variations in the microwave radiation field distribution can perturb measured line shapes and give rise to apparent frequency shifts without necessarily causing large asymmetries; this effect can explain previous measurements in which an apparent discrepancy with predictions from quantum electrodynamics was ob- served [L. Gurung, T. J. Babij, S. D. Hogan, and D. B. Cassidy, Phys. Rev. Lett. 125, 073002 (2020)0031-900710.1103/PhysRevLett.125.073002].
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