Special Issue "Spectral Line Shapes in Plasmas II"

A special issue of Atoms (ISSN 2218-2004).

Deadline for manuscript submissions: closed (31 January 2018)

Special Issue Editors

Guest Editor
Dr. Evgeny Stambulchik

Plasma Laboratory, Weizmann Institute of Science, Rehovot 7610001, Israel
Website | E-Mail
Phone: 972-8-9343610
Fax: 972-8-9343491
Interests: line-shape broadening in plasmas; Stark and Zeeman effects; polarization spectroscopy; non-LTE kinetics in plasmas
Guest Editor
Dr. Annette Calisti

Laboratoire PIIM, UMR7345, Aix-Marseille Université—CNRS, Centre Saint Jérôme Case 322, 13397 Marseille Cedex 20, France
E-Mail
Phone: +33(0)491282719
Guest Editor
Dr. Hyun-Kyung Chung

Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju Buk-gu Cheomdan-gwagiro 123, 61005, Korea
E-Mail
Phone: +82-10-7218-7285
Fax: +43 1 26007
Interests: atomic, molecular and plasma-surface interaction data for fusion applications; atomic processes in plasmas; non-LTE kinetics in plasmas; radiative properties of hot dense matter; plasma spectroscopy modeling
Guest Editor
Dr. Manuel Á. González Delgado

Departamento de Física Aplicada, Escuela Técnica Superior de Ingeniería Informática, Universidad de Valladolid, Paseo de Belén 15, 47011 Valladolid, Spain
E-Mail
Interests: atomic line shape calculation; plasma diagnostics; computer simulation; mLearning; biometrics

Special Issue Information

Dear Colleagues,

The Spectral Line Shapes in Plasma (SLSP) code comparison workshop series [1] has gained a steady momentum, with four meetings organized thus far—in 2012, 2013, 2015, and 2017. A large number of diverse problems have been analyzed, advancing understanding of the phenomena involved and increasing accuracy of the models. Doubtlessly, this has significantly aided in improving theoretical aspects of line-shape analysis—one of the most important tools for diagnostics of both laboratory and space plasma.

The first Special Issue of Atoms under this title was published in 2014 [2], covering selected topics from the first two workshops. With the hope of establishing tradition, we decided to arrange for the present Special Issue as a place for disseminating new results obtained in the course of the 3rd and 4th SLSP workshops. In addition, as it was also the case with the first “Spectral Line Shapes in Plasmas” Special Issue, we welcome contributions from the wider community working on diverse aspects of calculations of spectral line shapes in plasma.

[1] http://plasmagate.weizmann.ac.il/SLSP/

[2] http://www.mdpi.com/journal/atoms/special_issues/SpectralLineShapes

Dr. Evgeny Stambulchik
Dr. Annette Calisti
Dr. Hyun-Kyung Chung
Dr. Manuel Á. González Delgado
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 350 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • spectral line shapes
  • line broadening
  • Stark effect
  • Zeeman effect
  • code comparison

Published Papers (5 papers)

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Research

Open AccessFeature PaperArticle Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting
Atoms 2018, 6(2), 19; doi:10.3390/atoms6020019
Received: 28 February 2018 / Revised: 5 April 2018 / Accepted: 11 April 2018 / Published: 16 April 2018
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Abstract
Passive plasma spectroscopy is a well-established non-intrusive diagnostic technique. Depending on the emitter and its environment which determine the dominant interactions and effects governing emission line shapes, passive spectroscopy allows the determination of electron densities, emitter and perturber temperatures, as well as other
[...] Read more.
Passive plasma spectroscopy is a well-established non-intrusive diagnostic technique. Depending on the emitter and its environment which determine the dominant interactions and effects governing emission line shapes, passive spectroscopy allows the determination of electron densities, emitter and perturber temperatures, as well as other quantities like relative abundances. However, using spectroscopy requires appropriate line shape codes retaining all the physical effects governing the emission line profiles. This is required for line shape code developers to continuously correct or improve them to increase their accuracy when applied for diagnostics. This is exactly the aim expected from code–code and code–data comparisons. In this context, the He i 492 nm line emitted in a helium corona discharge at room temperature represents an ideal case since its profile results from several broadening mechanisms: Stark, Doppler, resonance, and van der Waals. The importance of each broadening mechanism depends on the plasma parameters. Here the profiles of the He i 492 nm in a helium plasma computed by various codes are compared for a selected set of plasma parameters. In addition, preliminary results related to plasma parameter determination using an experimental spectrum from a helium corona discharge at atmospheric pressure, are presented. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas II)
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Open AccessFeature PaperArticle Stark Broadening of Cr III Spectral Lines: DO White Dwarfs
Atoms 2018, 6(2), 15; doi:10.3390/atoms6020015
Received: 7 March 2018 / Revised: 24 March 2018 / Accepted: 26 March 2018 / Published: 3 April 2018
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Abstract
Using the modified semiempirical method of Dimitrijević and Konjević, Stark widths have been calculated for six Cr III transitions, for an electron density of 1017 cm3 and for temperatures from 5000–80,000 K. Results have been used for the investigation of
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Using the modified semiempirical method of Dimitrijević and Konjević, Stark widths have been calculated for six Cr III transitions, for an electron density of 10 17 cm 3 and for temperatures from 5000–80,000 K. Results have been used for the investigation of the influence of Stark broadening on spectral lines in cool DO white dwarf atmospheres. Calculated Stark widths will be implemented in the STARK-B database, which is also a part of the Virtual Atomic and Molecular Data Center (VAMDC). Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas II)
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Open AccessFeature PaperArticle The Fourth Workshop on Lineshape Code Comparison: Line Merging
Atoms 2018, 6(2), 13; doi:10.3390/atoms6020013
Received: 28 February 2018 / Revised: 26 March 2018 / Accepted: 29 March 2018 / Published: 31 March 2018
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Abstract
For a given set of plasma parameters, along a single series (Lyman, Balmer, etc.) the lines with higher principal quantum number (n) lines get progressively wider, closer to each other, and start merging for a certain critical n. In the
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For a given set of plasma parameters, along a single series (Lyman, Balmer, etc.) the lines with higher principal quantum number (n) lines get progressively wider, closer to each other, and start merging for a certain critical n. In the present work, four different codes (with further options) are used to calculate the entire Balmer series for moderate and high electron densities. Particular attention is paid to the relevant physics, such as the cutoff criteria, strong and penetrating electron collisions. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas II)
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Open AccessFeature PaperArticle Influence of Helical Trajectories of Perturbers on Stark Line Shapes in Magnetized Plasmas
Atoms 2018, 6(1), 12; doi:10.3390/atoms6010012
Received: 27 January 2018 / Revised: 23 February 2018 / Accepted: 23 February 2018 / Published: 13 March 2018
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Abstract
In plasmas subject to a strong magnetic field, the dynamical properties of the microfield are affected by the cyclotron motion, which can alter Stark-broadened lines. We illustrate this effect through calculations of the hydrogen Lyman α line in an ideal one-component plasma. A
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In plasmas subject to a strong magnetic field, the dynamical properties of the microfield are affected by the cyclotron motion, which can alter Stark-broadened lines. We illustrate this effect through calculations of the hydrogen Lyman α line in an ideal one-component plasma. A focus is put on the central Zeeman component. It is shown that the atomic dipole autocorrelation function decreases more slowly if the cyclotron motion is retained. In the frequency domain, this denotes a reduction of the line broadening. A discussion based on numerical simulations and analytical estimates is done. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas II)
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Open AccessFeature PaperArticle ZEST: A Fast Code for Simulating Zeeman-Stark Line-Shape Functions
Atoms 2018, 6(1), 11; doi:10.3390/atoms6010011
Received: 31 January 2018 / Revised: 4 March 2018 / Accepted: 7 March 2018 / Published: 12 March 2018
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Abstract
We present the ZEST code, dedicated to the calculation of line shapes broadened by Zeeman and Stark effects. As concerns the Stark effect, the model is based on the Standard Lineshape Theory in which ions are treated in the quasi-static approximation, whereas the
[...] Read more.
We present the ZEST code, dedicated to the calculation of line shapes broadened by Zeeman and Stark effects. As concerns the Stark effect, the model is based on the Standard Lineshape Theory in which ions are treated in the quasi-static approximation, whereas the effects of electrons are represented by weak collisions in the framework of a binary collision relaxation theory. A static magnetic field may be taken into account in the radiator Hamiltonian in the dipole approximation, which leads to additional Zeeman splitting patterns. Ion dynamics effects are implemented using the fast Frequency-Fluctuation Model. For fast calculations, the static ion microfield distribution in the plasma is evaluated using analytic fits of Monte-Carlo simulations, which depend only on the ion-ion coupling parameter and the electron-ion screening factor. Full article
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas II)
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