Observation of a resonance in the photodetachment of positronium negative ions. (July 2015)

• Record Type: Journal Article
• Authors: Michishio, Koji; Kuma, Susumu; Kanai, Tsuneto; Azuma, Toshiyuki; Wada, Ken; Mochizuki, Izumi; Hyodo, Toshio; Yagishita, Akira; Nagashima, Yasuyuki
• Is Part Of: Journal of physics. Number 635(2015)
• Publication Date: 2015-07
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/635/5/052050
• Languages: English
• ISSNs: 1742-6588

Abstract

Synopsis: 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.