Model potential approach for positron-atom collisions. II. Positronium formation in excited ns states in Na, K, Rb and Cs using the first Born approximation

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Abstract
For pt.I see ibid., vol.13, no.9, p.1919 (1980). Cross sections are computed for positronium formation into an arbitrary excited s state during positron scattering from the alkali atoms using the first Born approximation. Considering both the post and the prior forms of the interaction potential in the calculation, the results are presented for the incident positron energies from 5 to 50 eV. From these results it is found that for the alkali atoms the Ps formation cross section satisfies the inverse n3 law consistently at all positron energies.