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    Two-particle emission from LiF(1 0 0) upon photon, electron and positron excitation

    Access Status
    Open access via publisher
    Authors
    Van Riessen, Arie
    Schumann, O.
    Birke, M.
    Winkler, C.
    Kirschner, J.
    Date
    2009
    Type
    Conference Paper
    
    Metadata
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    Citation
    Van Riessen, A. and Schumann, O. and Birke, M. and Winkler, C. and Kirschner, J. 2009. Two-particle emission from LiF(1 0 0) upon photon, electron and positron excitation.
    Source Title
    Journal of Physics: Conference Series
    DOI
    10.1088/1742-6596/194/1/012056
    ISSN
    1742-6588
    School
    John de Laeter CoE in Mass Spectrometry
    URI
    http://hdl.handle.net/20.500.11937/48337
    Collection
    • Curtin Research Publications
    Abstract

    Electron pairs simultaneously emitted from a solid surface upon excitation with photons (double photoemission or (?, 2e)) or electrons (e,2e) provide information about the electron correlation in the solid which is mediated by exchange and Coulomb interactions. Without the Pauli restriction, the correlation of a positron with many electrons in a solid is dominated by Coulomb interactions. We have therefore undertaken the first comparative study of electron-electron and positron-electron pair emission upon impact with low energy photons, electrons and positrons. The target surface chosen for this study was LiF(1 0 0), a wide band gap dielectric that allows for a simple kinematical interpretation of the energy distribution of emitted pairs. We present the first results and discuss insights into the mechanisms of pair emission upon positron, electron and photon impact. © 2009 IOP Publishing Ltd.

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