Abstract
A first application of the Kohn method is made to the calculation of scattering parameters for positron collisions with the hydrogen molecular ion below the positronium formation threshold at 9.45 eV. Phase shifts from the two-centre Coulomb value are obtained for the lowest spheroidal partial wave of σ g + symmetry. For energies as low as 1.2 eV, it is found that a very flexible trial function must be used if accurate results are to be obtained.
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