EXCITATION AND IONIZATION OF THE POSITRONIUM ATOM IN POSITRONIUM-HYDROGEN MOLECULE-SCATTERING

We investigate discrete and continuum excitation of the Ps atom in Ps- H-2 scattering in the framework of the first Born approximation (FBA) using direct interactions. We report target elastic total cross sectio ns as well as angle integrated cross sections for the discrete and con tinuum excitations of the Ps atom in the energy range 7-150 eV. The co ntinuum excitation of the Ps atom is identified as the channel respons ible for the experimental peak observed by Garner and Laricchia [Proc. Positron Workshop '95, Can. J. Phys., in press].