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- W4366265711 abstract "We report measurements of the positronium (Ps) $2^{3}S_{1}ensuremath{rightarrow}2^{3}P_{2}$ 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)]." @default.
- W4366265711 created "2023-04-20" @default.
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- W4366265711 date "2023-04-18" @default.
- W4366265711 modified "2023-10-16" @default.
- W4366265711 title "Microwave spectroscopy of positronium atoms in free space" @default.
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- W4366265711 doi "https://doi.org/10.1103/physreva.107.042810" @default.
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