Low Energy Positron Scattering from Molecular Hydrogen*

As the simplest homonuclear diatomic molecule, molecular hydrogen is an attractive target for fundamental measurements of positron interactions, and comparisons of these measurements with the best contemporary scattering theory. Using a low-energy, high-resolution positron beam, measurements have been taken of positron scattering from molecular hydrogen between 1 and 200 eV. Total scattering, total elastic scattering, and positronium formation cross sections will be presented, as will as a range of elastic differential cross sections. Comparisons will be made with previous positron and electron scattering measurements and theoretical calculations.