Time-of-flight spectrometer for the measurement of angular distributions of scattered slow positrons and electrons
A technique for measuring directly the angular distributions, and consequently the absolute differential cross sections, for positron- and electron-atom elastic scattering is described. By exploiting time-of-flight spectrometry, simultaneous measurement over a wide range of forward angles is achieved. The structure and performance of the components of the experimental system are described in detail, and the reliability of the apparatus in the measurement of positron-atom cross sections is tested by using the same spectrometer to study electron scattering. Results are presented for elastic electron-argon scattering at energies between 5 and 20 eV which are in reasonable agreement with other recent results. Systematic effects on the measurements are discussed.
- Research Organization:
- Center for Positron Studies, The University of Texas at Arlington, Arlington, Texas 76019
- OSTI ID:
- 5268316
- Journal Information:
- Rev. Sci. Instrum.; (United States), Vol. 51:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ELECTRON-ATOM COLLISIONS
POSITRON-ATOM COLLISIONS
ELECTRON SPECTROMETERS
PERFORMANCE
ELASTIC SCATTERING
TIME-OF-FLIGHT SPECTROMETERS
ANGULAR DISTRIBUTION
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRON DETECTION
ELECTRONS
ERRORS
EV RANGE 01-10
EV RANGE 10-100
FABRICATION
POSITRON DETECTION
POSITRONS
RELIABILITY
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ATOM COLLISIONS
CHARGED PARTICLE DETECTION
COLLISIONS
CROSS SECTIONS
DETECTION
DISTRIBUTION
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EV RANGE
FERMIONS
INFORMATION
LEPTONS
MEASURING INSTRUMENTS
NONMETALS
POSITRON COLLISIONS
RADIATION DETECTION
RARE GASES
SCATTERING
SPECTROMETERS
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena