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Atoms 2014, 2(2), 277-298; doi:10.3390/atoms2020277

Spectral Line Shapes of He I Line 3889 Å

Institute of Physics, University of Rostock, Rostock 18051, Germany
Departamento de Física Aplicada, Universidad de Valladolid, Valladolid 47071, Spain
Departamento de Óptica, Universidad de Valladolid, Valladolid 47071, Spain
Scientific Research Institute for Experimental and Theoretical Physics of Al-FarabiKazakh National University, Almaty, Kazakhstan
Institute of Theoretical Physics, Curtin University, Perth, WA 6845, Australia
Author to whom correspondence should be addressed.
Received: 31 March 2014 / Revised: 5 June 2014 / Accepted: 10 June 2014 / Published: 23 June 2014
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas)
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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. View Full-Text
Keywords: spectral line shapes; Green’s function; T-matrix; molecular dynamics simulations; microfield distribution function; plasma diagnostics spectral line shapes; Green’s function; T-matrix; molecular dynamics simulations; microfield distribution function; plasma diagnostics

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Omar, B.; González, M.Á.; Gigosos, M.A.; Ramazanov, T.S.; Jelbuldina, M.C.; Dzhumagulova, K.N.; Zammit, M.C.; Fursa, D.V.; Bray, I. Spectral Line Shapes of He I Line 3889 Å. Atoms 2014, 2, 277-298.

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