Photodetachment and some rearrangement cross sections for the negative positronium ion

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Abstract
First theoretical estimates of cross sections for capture and detachment in collisions between protons and negative positronium ions are reported in the energy range 1-100 keV lab for the incident proton. Cross sections have been obtained for a one-active-electron model of Ps- introducing an effective potential for interactions between the outer electron and the positronium core in the system. In the authors calculations, they have applied the semiclassical (impact parameter) formalism using a two-centre atomic orbital expansion with 22 states. In order to test the effective potentials, the authors have computed the photodetachment of Ps- and found that the present approximation is more accurate than the zero-range asymptotic model of Bhatia and Drachman (1985) for incident light with lambda >10*103 AA. A brief discussion of some further approximations made in this work is also given.