Add time:08/29/2019         Source:sciencedirect.com

We investigate ortho positronium (Ps) scattering from H(2s), H(3s) excited states of hydrogen using a model coupled-channel formalism that was previously found to yield correct binding and resonance energies for H(1s) targets [Phys. Rev. A 59 (1999) 2058]. Like Ho, and Yan and Ho, we find several resonances corresponding to PsH thresholds. We also find that the energy of some of these resonant states lie below the corresponding Ps(1s)H(ns) thresholds signifying the possible existence of stable or unstable excited PsH states. In addition, we present elastic, inelastic and quenching cross sections in the energy range 0–30 eV.

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