• Coulomb—Born—Oppenheimer approximation in Ps—H scattering

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      https://www.ias.ac.in/article/fulltext/pram/066/02/0415-0422

    • Keywords

       

      Positronium; ionization; exchange; electron-spin; continuum; Coulomb wave function

    • Abstract

       

      To improve the Coulomb-Born approximation (CBA) theory of ionization in positronium (Ps) and atom scattering, the effect of exchange is introduced. The nine-dimensional exchange amplitude for ionization of Ps in Ps—H scattering is reduced to a two-dimensional integral using the present Coulomb-Born-Oppenheimer approximation (CBOA). The methodology is extremely useful to evaluate ionization parameters for different target systems and for different types of ionization processes. It is then applied to evaluate the Ps-ionization cross-section and to estimate the effect of exchange on Psionization in Ps-H system. We establish the importance of exchange at lower energy region.

    • Author Affiliations

       

      Hasi Ray1

      1. Department of Physics, Indian Institute of Technology Roorkee, Roorkee - 247 667, India
    • Dates

       
  • Pramana – Journal of Physics | News

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