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    Spectral Line Shapes of He I Line 3889 Å

    212979_140647_Bray_I__Spectral_line_shapes_of_He_I_line.pdf (431.9Kb)
    Access Status
    Open access
    Authors
    Omar, B.
    González, M.
    Gigosos, M.
    Ramazanov, T.
    Jelbuldina, M.
    Dzhumagulova, K.
    Zammit, Mark
    Fursa, Dmitry
    Bray, Igor
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Omar, B. and González, M. and Gigosos, M. and Ramazanov, T. and Jelbuldina, M. and Dzhumagulova, K. and Zammit, M. et al. 2014. Spectral Line Shapes of He I Line 3889 Å. Atoms. 2: pp. 277-298.
    Source Title
    Atoms
    DOI
    10.3390/atoms2020277
    ISSN
    2218-2004
    School
    Department of Physics and Astronomy
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/ Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/4259
    Collection
    • Curtin Research Publications
    Abstract

    Spectral line shapes of neutral helium 3889 Å(23S–33P) transition line are calculated by using several theoretical methods. The electronic contribution to the line broadening is calculated from quantum statistical many-particle theory by using thermodynamic Green's function, including dynamic screening of the electron-atom interaction. The ionic contribution is taken into account in a quasistatic approximation, where a static microfield distribution function is presented. Strong electron collisions are consistently considered with an effective two-particle T-matrix approach, where Convergent Close Coupling method gives scattering amplitudes including Debye screening for neutral helium. Then the static profiles converted to dynamic profiles by using the Frequency Fluctuation Model. Furthermore, Molecular Dynamics simulations for interacting and independent particles are used where the dynamic sequence of microfield is taken into account. Plasma parameters are diagnosed and good agreements are shown by comparing our theoretical results with the recent experimental result of Jovićević et al. (J. Phys. B: At. Mol. Opt. Phys. 2005, 38, 1249). Additionally, comparison with various experimental data in a wide range of electron density ne ≈ (1022− 1024)m−3 and temperature T ≈ (2−6) × 104 K are presented.

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