Observation of surface traps and vacancy trapping with slow positrons
Journal Article
·
· Phys. Rev. Lett.; (United States)
A beam of monoenergetic positrons incident on clean metallic surfaces has been employed to measure positronium yield as a function of sample temperature and positron energy. These results show an increase in the positronium fraction as a function of temperature which is identified as thermally activated detrapping of positrons from a surface trap. Estimates are made of the depths of these traps. Positrons are observed to trap at vacancies and a monovacancy formation enthalpy is extracted from the data utilizing a simple model.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 5940719
- Journal Information:
- Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 43:5; ISSN PRLTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
AUGER ELECTRON SPECTROSCOPY
COHERENT SCATTERING
COLLISIONS
COPPER
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTARY PARTICLES
ELEMENTS
ENTHALPY
FERMIONS
LEPTONS
METALS
PHYSICAL PROPERTIES
POINT DEFECTS
POSITRON COLLISIONS
POSITRONIUM
POSITRONS
SCATTERING
SILVER
SPECTROSCOPY
SURFACES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRAPPING
VACANCIES
WORK FUNCTIONS
YIELDS
360104* -- Metals & Alloys-- Physical Properties
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
AUGER ELECTRON SPECTROSCOPY
COHERENT SCATTERING
COLLISIONS
COPPER
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTARY PARTICLES
ELEMENTS
ENTHALPY
FERMIONS
LEPTONS
METALS
PHYSICAL PROPERTIES
POINT DEFECTS
POSITRON COLLISIONS
POSITRONIUM
POSITRONS
SCATTERING
SILVER
SPECTROSCOPY
SURFACES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRAPPING
VACANCIES
WORK FUNCTIONS
YIELDS