Effect of H- ion formation on positronium-hydrogen elastic scattering

Positronium-hydrogen scattering has been reinvestigated considering the charge-transfer rearrangement channel Ps + H--> e(+) + H- in the coupled-channel formalism. The virtual effects of this rearrangement channel on scattering length, PsH binding energy, and low-energy (0-10 eV) elastic cross sections are evaluated and H- formation cross sections are reported for energies up to 100 eV. Results indicate that the inclusion of such a rearrangement channel could be of significant importance in obtaining a converged description of PsH scattering in any ab initio coupled-channel model.