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    Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory

    Access Status
    Fulltext not available
    Authors
    Lorenzen, S.
    Omar, B.
    Zammit, Mark
    Fursa, Dmitry
    Bray, Igor
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Lorenzen, Sonja and Omar, Banaz and Zammit, Mark C. and Fursa, Dmitry V. and Bray, Igor. 2014. Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory. Physical Review E. 89 (2): pp. 1-13.
    Source Title
    Physical Review E
    DOI
    10.1103/PhysRevE.89.023106
    ISSN
    1539-3755
    URI
    http://hdl.handle.net/20.500.11937/28847
    Collection
    • Curtin Research Publications
    Abstract

    To apply spectroscopy as a diagnostic tool for dense plasmas, a theoretical approach to pressure broadening is indispensable. Here, a quantum-statistical theory is used to calculate spectral line shapes of few-electron atoms. Ionic perturbers are treated quasistatically as well as dynamically via a frequency fluctuation model. Electronic perturbers are treated in the impact approximation. Strong electron-emitter collisions are consistently taken into account with an effective two-particle T-matrix approach. Convergent close-coupling calculations give scattering amplitudes including Debye screening for neutral emitters. For charged emitters, the effect of plasma screening is estimated. The electron densities considered reach up to ne=1027 m-3. Temperatures are between T=104 and 105 K. The results are compared with a dynamically screened Born approximation for Lyman lines of H and H-like Li as well as for the He 3889 Å line. For the last, a comprehensive comparison to simulations and experiments is given. For the H Lyman-a line, the width and shift are drastically reduced by the Debye screening. In the T-matrix approach, the line shape is notably changed due to the dependence on the magnetic quantum number of the emitter, whereas the difference between spin-scattering channels is negligible.

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