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    Near-Threshold Cross Sections for Electron and Positron Impact Ionization of Atomic Hydrogen

    Access Status
    Fulltext not available
    Authors
    Bray, Igor
    Bray, A.
    Fursa, Dmitry
    Kadyrov, Alisher
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Bray, I. and Bray, A. and Fursa, D. and Kadyrov, A. 2018. Near-Threshold Cross Sections for Electron and Positron Impact Ionization of Atomic Hydrogen. Physical Review Letters. 121 (20): Article ID 203401.
    Source Title
    Physical Review Letters
    DOI
    10.1103/PhysRevLett.121.203401
    ISSN
    0031-9007
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/70930
    Collection
    • Curtin Research Publications
    Abstract

    Using classical arguments Wannier [Phys. Rev. 90, 817 (1953)PHRVAO0031-899X10.1103/PhysRev.90.817] proposed an electron-impact ionization cross section for neutral atoms to behave as E1.127, where E is the excess energy above threshold. Using similar arguments Klar [J. Phys. B 14, 4165 (1981)JPAMA40022-370010.1088/0022-3700/14/21/027] obtained E2.65 to be the corresponding threshold law for positron impact. Recently, Babij et al. [Phys. Rev. Lett. 120, 113401 (2018)PRLTAO0031-900710.1103/PhysRevLett.120.113401] measured near-threshold positron-impact breakup behavior to be similar to that expected for electrons. Using the convergent close-coupling method for the atomic hydrogen target, we examine cross sections at near-threshold energies for electron and positron impact. Contrary to the experiment, the calculated cross sections are found to behave differently for the two projectiles and consistently with the aforementioned threshold laws, despite the entirely quantum nature of these problems. For electron impact, the threshold behavior holds while the total electron spin asymmetry remains constant, whereas for positron scattering the threshold law holds for breakup while the positronium-formation component of the ionization cross section remains constant.

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