Configuration-interaction calculations of positron binding to group-II elements

Michael William James Bromley, James Mitroy

    Research output: Contribution to journalComment/debate


    The configuration-interaction (CI) method is applied to the study of positronic magnesium (e+Mg), positronic calcium (e+Ca), and positronic strontium (e+Sr). The CI expansion was seen to converge slowly with respect to Lmax, the maximum angular momentum of any orbital used to construct the CI basis. Despite doing explicit calculations with Lmax=10, extrapolation corrections to the binding energies for the Lmax→∞ limit were substantial in the case of e+Ca (25%) and e+Sr (50%). The extrapolated binding energies were 0.0162 hartree for e+Mg, 0.0165 hartree for e+Ca, and 0.0101 hartree for e+Sr. The static-dipole polarizabilities for the neutral parent atoms were computed as a by-product, giving 71.7a03, 162a03, and 204a03 for Mg, Ca, and Sr, respectively.
    Original languageEnglish
    Pages (from-to)062505-1-062505-10
    Number of pages10
    JournalPhysical Review A (Atomic, Molecular and Optical Physics)
    Issue number6
    Publication statusPublished - 2002


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