Gurung, L;
Babij, TJ;
Pérez-Ríos, J;
Hogan, SD;
Cassidy, DB;
(2021)
Observation of asymmetric line shapes in precision microwave spectroscopy of the positronium 2S13→2PJ3 ( J=1,2 ) fine-structure intervals.
Physical Review A
, 103
(4)
, Article 042805. 10.1103/physreva.103.042805.
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Abstract
We report new measurements of the positronium (Ps) 2 3 S 1 → 2 3 P J fine-structure intervals, ν 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 ν 1 and ν 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 ν 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.
| Type: | Article |
|---|---|
| Title: | Observation of asymmetric line shapes in precision microwave spectroscopy of the positronium 2S13→2PJ3 ( J=1,2 ) fine-structure intervals |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/physreva.103.042805 |
| Publisher version: | https://doi.org/10.1103/PhysRevA.103.042805 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10126237 |
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