Phase-Variation Ramsey Spectroscopy of the 2 3 S 1 → 2 3 P 2 Interval in Positronium
Abstract
The 2 ^{3}S_{1}→2 ^{3}P_{2} interval (ν_{2}) in positronium has been measured using a phase-variation separated oscillatory fields technique. A beam of positronium atoms in the 2 ^{3}S_{1} state was passed through two spatially separated coherent microwave fields tuned close to the ν_{2} resonance frequency (8626.71±0.08 MHz), and the surviving beam fraction was recorded as a function of the relative phase between the fields. The resonance frequency was obtained from the frequency dependence of the phase of the interference signal without scanning over the full spectral line shape of the transition. We obtain ν_{2}=8626.39±1.17_{stat}±0.80_{sys} MHz, which is in agreement with QED theory.
Fields of Study & Subjects
Atomic and Molecular Physics
Advanced Frequency and Time Standards
Cold Atom Physics and Bose-Einstein Condensates
Publication details
- Journal / source
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Volume
- 136
- Issue
- 3
- Pages
- 033001–033001
- Publication date
- 2 January 2026
- Language
- EN