Low-Energy Positron-Matter Interactions Using Trap-Based Beams
Final rept. 15 Apr 2001-31 Mar 2002
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS
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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.
- Nuclear Physics and Elementary Particle Physics
- Plasma Physics and Magnetohydrodynamics