Coulomb—Born—Oppenheimer approximation in Ps—H scattering |
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Authors: | Hasi Ray |
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Institution: | (1) Department of Physics, Indian Institute of Technology Roorkee, 247 667 Roorkee, India |
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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. |
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Keywords: | Positronium ionization exchange electron-spin continuum Coulomb wave function |
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