Anisotropic Photodetachment of Positronium Negative Ions with Linearly Polarized Light,Physical Review Letters

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Anisotropic Photodetachment of Positronium Negative Ions with Linearly Polarized Light
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-05-14 , DOI: 10.1103/physrevlett.132.203001
Koji Michishio _{1,

2} , Luca Chiari _{2,

3} , Fumi Tanaka ₂ , Yasuyuki Nagashima ₂

Affiliation

We report on the anisotropic photodetachment of positronium negative ions, followed by the dissociation into

p

-wave electrons and positronium atoms, with a linearly polarized laser beam. We have observed a strong recoil effect of the photoelectrons on the translation momentum of the dissociated positronium atoms. With polarization angle-resolved measurements, the asymmetry parameter of the photoemission angular distribution of the ions at a photon energy of 1.165 eV was determined to be

1.9 7 \pm 0.0 4 (stat) \pm 0.0 7 (syst)

, in agreement with a theoretical prediction. The present method can be applied to explore the unrevealed dissociation dynamics of exotic particle systems and their manipulation with polarized light.

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