Spectroscopy of positronium emission from alkali halides

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.40.2060· OSTI ID:6026851

Tuomisaari, M; Howell, R H; McMullen, T

Energy and angular distributions of the positronium emitted from single-crystal samples of the alkali halides LiF, NaF, KCl, KBr, and KI following bombardment of the surfaces with 0.1--4-keV positrons are reported. Energetically narrow positronium distributions were formed at the positron implant depth, and this hot positronium diffused to the surface, losing energy in the process. An analysis of the data using a diffusion model yields an estimate of the strength of the positronium-phonon coupling. This coupling is found to be energy dependent, with the effective deformation potential decreasing as the positronium energy increases. Positronium work functions and binding-energy estimates are also given. The angular distributions of the emitted positronium from all samples except LiF were sharply peaked in the forward direction. The energy distributions from the LiF samples also differed from those of the other alkali halides by showing two distinct energy components instead of a single peak.

• Research Organization: Lawrence Livermore National Laboratory, Livermore, California 94550 (US); Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6026851
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 40:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ANGULAR DISTRIBUTION
BINDING ENERGY
BROMIDES
BROMINE COMPOUNDS
CAPTURE
CHLORIDES
CHLORINE COMPOUNDS
COLLISIONS
CRYSTALS
DISTRIBUTION
ELECTRON CAPTURE
EMISSION
ENERGY
ENERGY RANGE
ENERGY SPECTRA
EV RANGE
EV RANGE 100-1000
FLUORIDES
FLUORINE COMPOUNDS
FUNCTIONS
HALIDES
HALOGEN COMPOUNDS
KEV RANGE
KEV RANGE 01-10
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
MONOCRYSTALS
POSITRON COLLISIONS
POSITRONIUM
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
POTASSIUM FLUORIDES
SODIUM COMPOUNDS
SODIUM FLUORIDES
SPECTRA
WORK FUNCTIONS