Biswas, P. K. [UNESP]2014-05-272014-05-272000-01-01Physical Review A - Atomic, Molecular, and Optical Physics, v. 61, n. 1, p. 125021-125026, 2000.1050-2947http://hdl.handle.net/11449/66055We investigate ortho-positronium-lithium-atom (Ps-Li) scattering using static-exchange and three-Ps-state coupled-channel calculations. The present three-PS-state scheme, while closely agreeing with the resonance and binding energies in the Ps-H system, predicts S-, P-, and D-wave resonances at 4.25 eV, 4.9 eV, and, 5.25 eV. respectively, in the electronic spin-singlet channel of Ps-Li scattering. The present calculation also yields a Ps-Li binding in this attractive singlet channel with an approximate binding energy of 0.218 eV, which is in adherence with the recent findings of a chemically stable PsLi system using stocastic variational and quantum Monte Carlo calculations. We further report elastic, Ps(2s)-, and Ps(2p)-excitation cross sections at low to medium energies (0.068-30 eV).125021-125026engArtigo10.1103/PhysRevA.61.012502WOS:000085168800031Acesso aberto2-s2.0-00096305102-s2.0-0009630510.pdf