What do we learn from the electric field effect on Ps formation in liquids?

Abstract

The diffusion–recombination model has been extended for consideration of positronium formation in the presence of an external electric field. The important basic ideas and main issues are discussed. It is shown that because of electrical neutrality of the terminal positron blob, e+, easily escapes from the blob during thermalization while intratrack electrons are kept in the blob by an electric field of the primary ions. Ion–electron recombination does not appear to significantly compete with Ps formation.