This article is a brief overview of opportunities and challenges in the area of low-energy positron and positronium atomic physics. The ideas presented here come from discussion during the final, summary session of the XIII International Workshop on Low Energy Positron and Positronium Physics, Campinas Brazil, July 2005. 2006 Elsevier B.V. All rights reserved. As is the custom, the final sessio...

We present total, elastic, and inelastic cross sections for positron and electron scattering from tetrahydrofuran (THF) in the energy range between 1 and 5000 eV. Total cross sections (TCS), positronium formation cross sections, the summed inelastic integral cross sections (ICS) for electronic excitations and direct ionization, as well as elastic differential cross sections (DCS) at selected in...