Channeling effects on positron transmission through thin crystals

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.6369· OSTI ID:6791181

Schultz, P J; Logan, L R; Jackman, T E; Davies, J A

We present results of low-energy positron-channeling studies in Si(100) crystals at incident energies of 10--50 keV. Strong channeling effects are observed for 50-keV positrons in several axes and planes of the submicrometer single crystals. The traditionally shaped channeling dips observed for the <100> axial case have (for most of the energy range studied) minimum yields that are consistent with extrapolations from previously reported high-energy proton studies of silicon and half-widths that are consistent with classical predictions. At this energy, variations in electron scattering with incident angle are known to be associated with diffraction phenomena. Multiple scattering of the low-energy positrons prohibits the observation of fine structure that is expected from diffraction effects.

• Research Organization: Department of Physics, The University of Western Ontario, London, Ontario, Canada N6A 3K7
• OSTI ID: 6791181
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Journal Issue: 10 Vol. 38:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams &amp; Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
CHANNELING
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FINE STRUCTURE
INCIDENCE ANGLE
KEV RANGE
KEV RANGE 10-100
LEPTONS
MONOCRYSTALS
MULTIPLE SCATTERING
POSITRON CHANNELING
POSITRONS
SCATTERING
SEMIMETALS
SILICON
TRANSMISSION