Positron-atom scattering using pseudostate energy shifts

James Mitroy, J Zhang, Michael Bromley, S Young

    Research output: Contribution to journalArticle

    Abstract

    A method to generate low-energy phase shifts for elastic scattering using bound-state calculations is applied to the problem of e+ -Mg and e+ -Zn scattering after an initial validation on the e+ -Cu system. The energy shift between a small reference calculation and the largest possible configuration interaction calculation of the lowest-energy pseudostate is used to tune a semiempirical optical potential. The potential was further fine-tuned by utilizing the energy of the second lowest pseudostate. The s - and p -wave phase shifts for positron scattering from Mg and Zn are given from threshold to the first excitation threshold. The e+ -Mg cross section has a prominent p -wave shape resonance at an energy of about 0.096 eV with a width of 0.106 eV. The peak cross section for e+ -Mg scattering is about 4800 a02, while Zeff achieves a value of 1310 at an energy of 0.109 eV. � 2008 The American Physical Society.
    Original languageEnglish
    Pages (from-to)012715-1-012715-13
    Number of pages13
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume78
    Issue number1
    Publication statusPublished - 2008

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    Mitroy, J., Zhang, J., Bromley, M., & Young, S. (2008). Positron-atom scattering using pseudostate energy shifts. Physical Review A - Atomic, Molecular, and Optical Physics, 78(1), 012715-1-012715-13.