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Atoms, Volume 2, Issue 3 (September 2014), Pages 299-381

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Editorial

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Open AccessEditorial Special Issue on Spectral Line Shapes in Plasmas
Atoms 2014, 2(3), 378-381; doi:10.3390/atoms2030378
Received: 16 July 2014 / Accepted: 17 July 2014 / Published: 7 August 2014
Cited by 1 | PDF Full-text (113 KB) | HTML Full-text | XML Full-text
Abstract
Line-shape analysis is one of the most important tools for diagnostics of both laboratory and space plasmas. Its reliable implementation requires sufficiently accurate calculations, which imply the use of analytic methods and computer codes of varying complexity, and, necessarily, varying limits of applicability
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Line-shape analysis is one of the most important tools for diagnostics of both laboratory and space plasmas. Its reliable implementation requires sufficiently accurate calculations, which imply the use of analytic methods and computer codes of varying complexity, and, necessarily, varying limits of applicability and accuracy. However, studies comparing different computational and analytic methods are almost non-existent. The Spectral Line Shapes in Plasma (SLSP) code comparison workshop series [1] was established to fill this gap. Numerous computational cases considered in the two workshops organized to date (in April 2012 and August 2013 in Vienna, Austria) not only serve the purpose of code comparison, but also have applications in research of magnetic fusion, astrophysical, laser-produced plasmas, and so on. Therefore, although the first workshop was briefly reviewed elsewhere [2], and will likely be followed by a review of the second one, it was unanimously decided by the participants that a volume devoted to results of the workshops was desired. It is the main purpose of this special issue. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas) Print Edition available

Research

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Open AccessArticle Ion Dynamics Effect on Stark-Broadened Line Shapes: A Cross-Comparison of Various Models
Atoms 2014, 2(3), 299-318; doi:10.3390/atoms2030299
Received: 30 April 2014 / Revised: 10 June 2014 / Accepted: 16 June 2014 / Published: 4 July 2014
Cited by 14 | PDF Full-text (611 KB) | HTML Full-text | XML Full-text
Abstract
Modeling the Stark broadening of spectral lines in plasmas is a complex problem. The problem has a long history, since it plays a crucial role in the interpretation of the observed spectral lines in laboratories and astrophysical plasmas. One difficulty is the characterization
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Modeling the Stark broadening of spectral lines in plasmas is a complex problem. The problem has a long history, since it plays a crucial role in the interpretation of the observed spectral lines in laboratories and astrophysical plasmas. One difficulty is the characterization of the emitter’s environment. Although several models have been proposed over the years, there have been no systematic studies of the results, until now. Here, calculations from stochastic models and numerical simulations are compared for the Atoms 2014, 2 300 Lyman-α and -β lines in neutral hydrogen. Also discussed are results from the Helium-α and -β lines of Ar XVII. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas) Print Edition available
Open AccessArticle Line-Shape Code Comparison through Modeling and Fitting of Experimental Spectra of the C ii 723-nm Line Emitted by the Ablation Cloud of a Carbon Pellet
Atoms 2014, 2(3), 319-333; doi:10.3390/atoms2030319
Received: 9 May 2014 / Revised: 28 May 2014 / Accepted: 25 June 2014 / Published: 14 July 2014
Cited by 3 | PDF Full-text (820 KB) | HTML Full-text | XML Full-text
Abstract
Various codes of line-shape modeling are compared to each other through the profile of the C ii 723-nm line for typical plasma conditions encountered in the ablation clouds of carbon pellets, injected in magnetic fusion devices. Calculations were performed for a single electron
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Various codes of line-shape modeling are compared to each other through the profile of the C ii 723-nm line for typical plasma conditions encountered in the ablation clouds of carbon pellets, injected in magnetic fusion devices. Calculations were performed for a single electron density of 1017 cm−3 and two plasma temperatures (T = 2 and 4 eV). Ion and electron temperatures were assumed to be equal (Te = Ti = T). The magnetic field, B, was set equal to either to zero or 4 T. Comparisons between the line-shape modeling codes and two experimental spectra of the C ii 723-nm line, measured perpendicularly to the B-field in the Large Helical Device (LHD) using linear polarizers, are also discussed. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas) Print Edition available
Open AccessArticle Spectral-Kinetic Coupling and Effect of Microfield Rotation on Stark Broadening in Plasmas
Atoms 2014, 2(3), 334-356; doi:10.3390/atoms2030334
Received: 13 May 2014 / Revised: 17 June 2014 / Accepted: 2 July 2014 / Published: 30 July 2014
Cited by 4 | PDF Full-text (1514 KB) | HTML Full-text | XML Full-text
Abstract
The study deals with two conceptual problems in the theory of Stark broadening by plasmas. One problem is the assumption of the density matrix diagonality in the calculation of spectral line profiles. This assumption is closely related to the definition of zero wave
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The study deals with two conceptual problems in the theory of Stark broadening by plasmas. One problem is the assumption of the density matrix diagonality in the calculation of spectral line profiles. This assumption is closely related to the definition of zero wave functions basis within which the density matrix is assumed to be diagonal, and obviously violated under the basis change. A consistent use of density matrix in the theoretical scheme inevitably leads to interdependence of atomic kinetics, describing the population of atomic states with the Stark profiles of spectral lines, i.e., to spectral-kinetic coupling. The other problem is connected with the study of the influence of microfield fluctuations on Stark profiles. Here the main results of the perturbative approach to ion dynamics, called the theory of thermal corrections (TTC), are presented, within which the main contribution to effects of ion dynamics is due to microfield fluctuations caused by rotations. In the present study the qualitative behavior of the Stark profiles in the line center within predictions of TTC is confirmed, using non-perturbative computer simulations. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas) Print Edition available
Open AccessArticle On the Application of Stark Broadening Data Determined with a Semiclassical Perturbation Approach
Atoms 2014, 2(3), 357-377; doi:10.3390/atoms2030357
Received: 5 May 2014 / Revised: 20 June 2014 / Accepted: 16 July 2014 / Published: 7 August 2014
Cited by 4 | PDF Full-text (263 KB) | HTML Full-text | XML Full-text
Abstract The significance of Stark broadening data for problems in astrophysics, physics, as well as for technological plasmas is discussed and applications of Stark broadening parameters calculated using a semiclassical perturbation method are analyzed. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas) Print Edition available

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