Observation of a resonance in the photodetachment of positronium negative ions

29th International Conference on Photonic, Electronic, and Atomic Collisions

Michishio, Koji^1 ; Kuma, Susumu^2 ; Kanai, Tsuneto^2 ; Azuma, Toshiyuki^2 ; Wada, Ken^3 ; Mochizuki, Izumi^3 ; Hyodo, Toshio^3 ; Yagishita, Akira^3 ; Nagashima, Yasuyuki^1

Department of Physics, Tokyo University of Science, Shinjuku, Tokyo

162-8601, Japan^1

Atomic, Molecular and Optical Physics Laboratory, RIKEN, Wako, Saitama

351-0198, Japan^2

Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Ibaraki, Tsukuba

305-0801, Japan^3

关键词: Bound state;    Mass ratio;    Photo-detachment;    Resonance energies;    Shape resonance;    Three body;    Three-body problem;    UV region;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/5/052050/pdf
DOI  :  10.1088/1742-6596/635/5/052050

来源: IOP

【 摘 要 】

The positronium negative ion, e-e+e-, is one of the simplest three body bound-states. As its constituents have a unique mass ratio, the ion is an attractive candidate for the investigation of the genuine three-body problem. In the present work, laser spectroscopy of this ion has been demonstrated in the UV region. A shape resonance near the positronium (n=2) formation threshold was clearly observed and the resonance energy was estimated.