COUPLED-CHANNEL CALCULATIONS OF IONIZATION AND CHARGE-TRANSFER IN P+LI+,LI-2+ AND TRANSFER IN LI-2+,LI-3+ +H(1S) COLLISIONS
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abstract
Coupled-channel calculations have been carried out for p+Li+ collisions in the 70 to 400 keV amu-1 energy range and for p+Li 2+ for energies between 50 and 200 keV amu-1, in the authors' 'perturbative one-and-a-half-centre' (POHCE) formulation. This work includes the first test of the POHCE method for a system with more than one electron. Various effective one-electron target potentials for Li+, and their effect on the scattering cross sections, are discussed. The authors' p+Li+ cross sections for capture and ionisation, as well as their sum (total electron loss), are compared with the experiments of Gilbody's group and with other theoretical calculations. Their ionisation result is in good agreement with experiment; it would have been up to 50% too high without the POHCE modification of the single-centre method. Their capture result is lower than the measured cross section, as it was for p+He+. By time reversal their calculations also give capture cross sections for Li 2++H and Li3++H, for capture into each state in the lithium-centred part of the basis.
