Threshold Photodetachment Spectroscopy of the Positronium Negative Ion
| Autor: | Yugo Nagata, Toshiyuki Azuma, Luca Chiari, Koji Michishio, Susumu Kuma, Yasuyuki Nagashima, Riki Mikami, Taro Iizuka |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Amplifier General Physics and Astronomy Laser 01 natural sciences law.invention Positronium Ion law Electron affinity 0103 physical sciences Physics::Atomic and Molecular Clusters Optical parametric oscillator Physics::Atomic Physics Physics::Chemical Physics Atomic physics 010306 general physics Spectroscopy Quantum |
| Zdroj: | Physical review letters. 125(6) |
| ISSN: | 1079-7114 |
| Popis: | Threshold photodetachment spectroscopy of the positronium negative ion has been accomplished for the first time employing an efficient source of the ions and photodetachment techniques combined with a tunable optical parametric oscillator and amplifier laser. The photodetachment threshold, corresponding to the electron affinity of positronium ($1{^{3}S}_{1}$), was determined to be $326.88\ifmmode\pm\else\textpm\fi{}0.09(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.10(\mathrm{syst})\text{ }\text{ }\mathrm{meV}$ by laser photodetachment threshold measurements. This result is consistent with a variational calculation corrected for leading relativistic and quantum electrodynamical effects. |
| Databáze: | OpenAIRE |
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