Positron scattering by the negative hydrogen ion

Details Positron scattering by the negative hydrogen ion Positron scattering by the negative hydrogen ion

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrva..65c2715m&link_type=abstract

Physical Review A, vol. 65, Issue 3, id. 032715

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5

Positron Scattering, Atomic And Molecular Data, Spectra, And Spectral Parameters

Scientific paper

Results are presented for e+ scattering by H- in the impact energy range 0<=E0<=10 eV. These include integrated cross sections for Ps formation in the 1s, 2s, and 2p states, as well as in an aggregate of states with n>=3, and for direct ionization. Differential cross sections for Ps formation in the 1s, 2s, and 2p states are also exhibited. The calculations are based on a coupled pseudostate approach employing 19 Ps pseudostates centered on the e+. It is found that Ps formation in the 2p state dominates that in the 1s or 2s states below 8 eV, that formation in states with n>=3 exceeds the sum of the n=1 and n=2 cross sections above 2.5 eV, and that direct ionization outstrips total Ps formation above 6.3 eV. The threshold law (E0-->0) for exothermic Ps formation, which includes the cases Ps(1s), Ps(2s), and Ps(2p), is shown to be 1/E0.

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