An electrostatically-focused beam for reemitted positron energy spectroscopy

Conference · Fri Feb 01 04:00:00 EST 1991 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5069203

Goodyear, A; Farthing, I R; Coleman, P G ^[1]

---

1. School of Physics, University of East Anglia, Norwich NR4 7TJ (U.K.)

An ultrahigh vacuum system has been constructed in which 2 keV positrons are electrostatically transported and focused onto a solid surface which has been characterised by LEED and Auger spectroscopies. Slow positrons reemitted from the surface traverse a field-free region and enter the transport lens system of a hemispherical energy analyser. This last device potentially enables high-resolution measurements of the energy spectrum of the reemitted positrons. Preliminary low-resolution measurements of positron spectra from Cu(110) and polycrystalline W surfaces have been made under various conditions; the system is currently being developed and upgraded to improve the beam brightness as well as the energy and angular resolution.

• OSTI ID: 5069203
• Report Number(s): CONF-900798--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 218:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
440103* -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BEAMS
COLLISIONS
COPPER
CRYSTALS
DESIGN
ELECTROSTATIC LENSES
ELEMENTARY PARTICLES
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY SPECTRA
FERMIONS
FOCUSING
LENSES
LEPTON BEAMS
LEPTONS
MATTER
METALS
PARTICLE BEAMS
PERFORMANCE
POLYCRYSTALS
POSITRON BEAMS
POSITRON COLLISIONS
POSITRONS
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENTS