Excited, bound and resonant positron-atom systems

Michael Bromley, James Mitroy

    Research output: Chapter in Book/Report/Conference proceedingConference Paper published in Proceedings

    Abstract

    Calculations have demonstrated that eleven neutral atoms can bind positrons, while many more can bind positronium. This is a short review of recent progress made in understanding some of the underlying mechanisms. The emphasis here being on configuration interaction calculations with excited state configurations. These have demonstrated the existence of a2P o excited state of e+Ca, which consists predominantly of a positronium cluster orbiting the Ca+ ion in the L 1 partial wave. Preliminary results are presented of excited state positron binding to a model alkali atom, where the excited 1Po states are stable over a limited region. Implications for the unnatural parity, 2,4S o, states of PsH, LiPs, NaPs and KPs are also discussed. The e +Mg, e+Cu, e+Zn and e+Cd systems show a lack of a 2Po excited state, each instead possessing a low-energy p-wave shape resonance of varying strength. � 2010 IOP Publishing Ltd.
    Original languageEnglish
    Title of host publicationJournal of Physics
    Subtitle of host publicationConference Series
    Place of PublicationUnited Kingdom
    PublisherInstitute of Physics Publishing (IOP Publishing)
    Pages-
    Number of pages6
    Volume199
    ISBN (Print)1742-6588
    Publication statusPublished - 2010
    EventXV International workshop on Low Energy Positron and Positronium Physics - York University, CA
    Duration: 29 Jul 200929 Jul 2009

    Conference

    ConferenceXV International workshop on Low Energy Positron and Positronium Physics
    Period29/07/0929/07/09

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  • Cite this

    Bromley, M., & Mitroy, J. (2010). Excited, bound and resonant positron-atom systems. In Journal of Physics: Conference Series (Vol. 199, pp. -). Institute of Physics Publishing (IOP Publishing).