Photodetachment of positronium negative ions

Photodetachment of the positronium negative ion, a bound state of one positron and two electrons, has been observed. Development of a method to produce the ions efficiently using a Na coated tungsten surface has enabled the first observation of the photodetachment. The obtained lower limit of the ph...

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Bibliographic Details
Published in:Physical review letters 2011-04, Vol.106 (15), p.153401-153401, Article 153401
Main Authors: Michishio, K, Tachibana, T, Terabe, H, Igarashi, A, Wada, K, Kuga, T, Yagishita, A, Hyodo, T, Nagashima, Y
Format: Article
Language:English
Subjects:
ANIONS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ATOMIC AND MOLECULAR PHYSICS
BEAMS
BOUND STATE
CHARGED PARTICLES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CROSS SECTIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
IONS
LEPTONS
MANY-BODY PROBLEM
MATTER
MECHANICS
METALS
POSITRONIUM
POSITRONS
QUANTUM MECHANICS
REFRACTORY METALS
SURFACES
THREE-BODY PROBLEM
TRANSITION ELEMENTS
TUNGSTEN
WAVELENGTHS
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Summary:Photodetachment of the positronium negative ion, a bound state of one positron and two electrons, has been observed. Development of a method to produce the ions efficiently using a Na coated tungsten surface has enabled the first observation of the photodetachment. The obtained lower limit of the photodetachment cross section for the wavelength of 1064 nm is consistent with the theoretical calculations reported so far. The experimental field developed in the present work gives new opportunities to explore the quantum mechanical three-body problem and to develop energy-tunable positronium beams.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.106.153401