Efficient emission of positronium negative ions from Cs deposited W(100) surfaces

Development of Energy-Tunable Positronium Beams Employing the Photodetachment of Positronium Negative Ions

Recent progress on the development of an energy-tunable positronium beam is reviewed. We describe experimental results for the efficient emission of positronium negative ions from alkali-metal coated tungsten surfaces. The ions generated using this technique have been accelerated by an electric field and photodetached in order to produce positronium beams with a hitherto unrealized energy range...

Kinetic electron emission from Al surfaces by slow ions

M. Minniti,1 M. Commisso,1 A. Sindona,1 E. Sicilia,2 A. Bonanno,1 P. Barone,1 R. A. Baragiola,3 and P. Riccardi1,* 1Laboratorio IIS, Università della Calabria and INFN-Gruppo Collegato di Cosenza-87036 Rende, Cosenza, Italy 2Dipartimeto di Chimica, Università della Calabria-87036 Rende, Cosenza, Italy 3Laboratory for Atomic and Surface Physics, Department of Engineering Physics, University of V...

Electron Emission from Surfaces Induced by Slow Ions and Atoms

Increase in the positronium emission yield from polycrystalline tungsten surfaces by sodium coating

a Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan b Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan c Department of Physics, Northeastern University, Boston, MA 02115, USA d Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 3...

Monoenergetic positronium emission from metal-organic framework crystals.

Recently it has been discovered that positronium (Ps), after forming in metal-organic framework (MOF) crystals, is emitted into vacuum with a high efficiency and low energy that can only be explained by its propagating as delocalized Bloch states. We show that the Ps atoms are emitted from MOFs in a series of narrow energy peaks consistent with Ps at Bloch-state energy minima being emitted adia...