Cassidy, DB;
Hisakado, TH;
Tom, HWK;
Mills, AP;
(2012)
Positronium hyperfine interval measured via saturated absorption spectroscopy.
Physical Review Letters
, 109
(7)
, Article 073401. 10.1103/PhysRevLett.109.073401.
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Abstract
We report Doppler-free measurements of the positronium (Ps) Lyman-α transition using saturated absorption spectroscopy. In addition to a Lamb dip at wavelength λ =243.0218±0.0005nm, we also observed a crossover resonance at λ =243.0035±0.0005nm, arising from the excitation of 1S13 atoms to Zeeman mixed 2P states, followed by stimulated emission to the 1S01 ground state. Since (λ - λ ) is related to the Ps hyperfine interval E , this observation constitutes the first optical measurement of this quantity and yields E =198.4±4.2GHz. We describe improvements to the methodology that could lead to the ∼ppm level of precision required to address the long-standing discrepancy between QED calculations and precision experiments using microwave radiation to induce transitions between Zeeman shifted triplet Ps states. © 2012 American Physical Society.
| Type: | Article |
|---|---|
| Title: | Positronium hyperfine interval measured via saturated absorption spectroscopy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.109.073401 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.109.073401 |
| Language: | English |
| Additional information: | © 2012 American Physical Society |
| 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/1362292 |
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