Accession Number:

ADP012491

Title:

Low-Energy Positron-Matter Interactions Using Trap-Based Beams

Descriptive Note:

Final rept. 15 Apr 2001-31 Mar 2002

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS

Report Date:

2002-06-24

Pagination or Media Count:

11.0

Abstract:

We present an overview of nonneutral plasma techniques developed to study the interaction of low-energy positrons with atoms and molecules. Both scattering and positron annihilation experiments are described. The scattering experiments provide the first state-resolved cross sections for both vibrational excitation of molecules and electronic excitation of atoms and molecules by positron impact. The annihilation experiments provide the first energy-resolved measurements of positron annihilation. Extensions of these techniques are briefly discussed, including work to create a new generation of positron beams with multi-electron volt energy resolution and the development of methods to study atomic clusters and dust grains.

Subject Categories:

  • Nuclear Physics and Elementary Particle Physics
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE