Introduction

Abstract

The chemical physics of the positron and positronium (Ps) is concerned with the chemical aspects of the interaction of low-energy positrons with matter. Positrons injected into matter thermalize rapidly. In many insulating compounds some of the positrons form Ps. The positron and Ps might react with solutes, etc. before they ultimately annihilate into gamma photons. The properties of these photons, measured by gamma spectroscopy techniques, give information about the positron and Ps reactions before the annihilation.