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    Time-of-flight electron scattering from molecular hydrogen: Benchmark cross sections for excitation of the X 1 Sg+ ?b 3 Su+ transition

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    Authors
    Zawadzki, M.
    Wright, R.
    Dolmat, G.
    Martin, M.
    Hargreaves, L.
    Fursa, Dmitry
    Zammit, M.
    Scarlett, L.
    Tapley, J.
    Savage, J.
    Bray, Igor
    Khakoo, M.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Zawadzki, M. and Wright, R. and Dolmat, G. and Martin, M. and Hargreaves, L. and Fursa, D. and Zammit, M. et al. 2018. Time-of-flight electron scattering from molecular hydrogen: Benchmark cross sections for excitation of the X 1 Sg+ ?b 3 Su+ transition. Physical Review A - Atomic, Molecular, and Optical Physics. 97 (5).
    Source Title
    Physical Review A - Atomic, Molecular, and Optical Physics
    DOI
    10.1103/PhysRevA.97.050702
    ISSN
    2469-9926
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/68999
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 American Physical Society. The electron impact X1Sg+?b3Su+ transition in molecular hydrogen is one of the most important dissociation pathways to forming atomic hydrogen atoms, and is of great importance in modeling astrophysical and industrial plasmas where molecular hydrogen is a substantial constituent. Recently, it has been found that the convergent close-coupling (CCC) cross sections of Zammit et al. [Phys. Rev. A 95, 022708 (2017)10.1103/PhysRevA.95.022708] are up to a factor of 2 smaller than the currently recommended data. We have determined normalized differential cross sections for excitation of this transition from our experimental ratios of the inelastic to elastic scattering of electrons by molecular hydrogen using a transmission-free time-of-flight electron spectrometer, and find excellent agreement with the CCC calculations. Since there is already excellent agreement for the absolute elastic differential cross sections, we establish benchmark differential and integrated cross sections for the X1Sg+?b3Su+ transition, with theory and experiment being essentially in complete agreement.

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