Comparative studies of excitations and resonances in H-, Ps-, and e++H systems

The hyperspherical close coupling method for general Coulomb three-body systems is used to examine e-+H, e++Ps, and e++H collisions to investigate how the excitation cross sections and resonances depend on the masses, the charges, and the quantum statistics of the system. Hyperspherical potential curves are used to help unravel the nature of Feshbach resonances, shape resonances, and overlapping resonances in these systems