Electroproduction of relativistic positronium

Electroproduction of relativistic positronium may be of importance for obtaining beams of polarized or unpolarized positronium. We give cross sections for singlet and triplet positronium production in high-energy collisions of electrons on atoms, correct to all orders in the atomic number Z, including a complete description of atomic screening, using the Thomas-Fermi-Moli\`ere atomic model. The results are analogous to the photoproduction cross...