Absence of energy loss in positron emission from metal surfaces

Journal Article · Tue Oct 15 04:00:00 EDT 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.32.5484· OSTI ID:5146121

Gullikson, E M; Mills, Jr, A P; Crane, W S; Brown, B L

We have measured the energy distribution of positrons reemitted after implantation into W(110) and Ni(100) surfaces at room temperature. The previously reported broad distribution of the perpendicular component of the energy is now found to be due to a wide angular distribution of essentially monoenergetic positrons. The implied elasticity of the positron-emission process (e.g., less than 25 meV energy loss for 97% of the 1-eV positrons emitted from Ni) is in serious disagreement with present theories that require the emission of energetic electron-hole pairs for positron reemission from metals.

• Research Organization: ATandT Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 5146121
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 32:8; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COLLISIONS
ELEMENTS
ENERGY LOSSES
LOSSES
MEDIUM TEMPERATURE
METALS
NICKEL
POSITRON COLLISIONS
TRANSITION ELEMENTS
TUNGSTEN