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dc.contributor.authorOmar, B.
dc.contributor.authorGonzález, M.
dc.contributor.authorGigosos, M.
dc.contributor.authorRamazanov, T.
dc.contributor.authorJelbuldina, M.
dc.contributor.authorDzhumagulova, K.
dc.contributor.authorZammit, Mark
dc.contributor.authorFursa, Dmitry
dc.contributor.authorBray, Igor
dc.identifier.citationOmar, 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.

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.

dc.publisherMDPI AG
dc.subjectmolecular dynamics simulations
dc.subjectGreen’s function
dc.subjectplasma diagnostics
dc.subjectspectral line shapes
dc.subjectmicrofield distribution function
dc.titleSpectral Line Shapes of He I Line 3889 Å
dc.typeJournal Article

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

curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusOpen access

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