Effects of the polarisation potentials on positron-hydrogen inelastic scattering

The effects of various possibilities of "switching on" the polarisation potentials of e⁺ - H inelastic scattering on the coupled-static model are investigated in details. The partial elastic and positronium formation cross-sections of the new models are calculated for seven values of the total angular momentum l(0≤l≤6) at seventeen values of the incident energy k₁² within the Ore gap (6.8≤k₁²≤10.2 eV). The comparison between the present calculations and the elaborate variational results of Humberston [1, 2] and Brown and Humberston [3, 4] shows that the "switching on" of the polarisation potentials leads to overestimated values for the partial and total elastic and positronium formation cross-sections. This conclusion raises, at least to us, some doubts about the consistency of the polarized orbital principle when higher channels than the elastic one are opened. It seems that this principle is completely insufficient for describing the positron - atom inelastic processes.