Next Article in Journal / Special Issue
Ion Dynamics Effect on Stark-Broadened Line Shapes: A Cross-Comparison of Various Models
Previous Article in Journal / Special Issue
Influence of Microfield Directionality on Line Shapes
Atoms 2014, 2(2), 277-298; doi:10.3390/atoms2020277
Article

Spectral Line Shapes of He I Line 3889 Å

1,* , 2
,
3
,
4
,
4
,
4
,
5
,
5
 and
5
1 Institute of Physics, University of Rostock, Rostock 18051, Germany 2 Departamento de Física Aplicada, Universidad de Valladolid, Valladolid 47071, Spain 3 Departamento de Óptica, Universidad de Valladolid, Valladolid 47071, Spain 4 Scientific Research Institute for Experimental and Theoretical Physics of Al-FarabiKazakh National University, Almaty, Kazakhstan 5 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)
Download PDF [489 KB, uploaded 23 June 2014]

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.
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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote
MDPI and ACS Style

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.

View more citation formats

Related Articles

Article Metrics

Comments

Cited By

[Return to top]
Atoms EISSN 2218-2004 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert