Observation of asymmetric line shapes in precision microwave spectroscopy of the positronium 2 S 1 3 ? 2 P J 3 ( J = 1 , 2 ) fine-structure intervals
Observation of asymmetric line shapes in precision microwave spectroscopy of the positronium 2 S 1 3 ? 2 P J 3 ( J = 1 , 2 ) fine-structure intervals
复制标题
正电子素 2 S 1 3 ? 精密微波光谱中不对称线形的观察
DOI：
10.1103/physreva.103.042805
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发表时间：
2021
影响因子：
2.9
通讯作者：
Gurung L
中科院分区：
文献类型：
--
作者：
Gurung L
本文报道了电子偶素精细结构间隔的新测量结果。在实验中，Ps原子，光激发到辐射亚稳态能级，飞通过微波辐射场调谐驱动跃迁到short-livedlevels，这是通过随后的基态Ps湮灭辐射的时间谱检测。这两个和线的形状被发现是不对称的，这在一个完整的线形模型的情况下，防止准确地确定这些精细结构的间隔。相反，线的形状并没有表现出任何显着的不对称性，但观察到的间隔，被发现不同意QED理论的4.2个标准偏差。
We report new measurements of the positronium (Ps)fine-structure intervals,(). In the experiments, Ps atoms, optically excited to the radiatively metastablelevel, flew through microwave radiation fields tuned to drive transitions to the short-livedlevels, which were detected via the time spectrum of subsequent ground-state Ps annihilation radiation. Both theandline shapes were found to be asymmetric, which, in the absence of a complete line-shape model, prevents accurate determination of these fine-structure intervals. Conversely, theline shape did not exhibit any significant asymmetry; the observed interval, however, was found to disagree with QED theory by 4.2 standard deviations.