Observation of asymmetric line shapes in precision microwave spectroscopy of the positronium 2S13→2PJ3 ( J=1,2 ) fine-structure intervals
| Autor: | David Cassidy, T. J. Babij, L. Gurung, Jesús Pérez-Ríos, S. D. Hogan |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review A. 103 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.103.042805 |
| Popis: | We report new measurements of the positronium (Ps) $2^{3}S_{1}\ensuremath{\rightarrow}2^{3}P_{J}$ fine-structure intervals, ${\ensuremath{\nu}}_{J}$ ($J=0,1,2$). In the experiments, Ps atoms, optically excited to the radiatively metastable $2^{3}S_{1}$ level, flew through microwave radiation fields tuned to drive transitions to the short-lived $2^{3}P_{J}$ levels, which were detected via the time spectrum of subsequent ground-state Ps annihilation radiation. Both the ${\ensuremath{\nu}}_{1}$ and ${\ensuremath{\nu}}_{2}$ line 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, the ${\ensuremath{\nu}}_{0}$ line shape did not exhibit any significant asymmetry; the observed interval, however, was found to disagree with QED theory by 4.2 standard deviations. |
| Databáze: | OpenAIRE |
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