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.