Special Issue "The 5th Spectral Line Shapes Workshop: Current Topics in Spectral Line Broadening in Plasmas"

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

Deadline for manuscript submissions: closed (31 March 2021).

Special Issue Editor

Dr. Spiros Alexiou
E-Mail
Guest Editor
Hellenic Army Academy, Vari 166 72, Greece
Interests: Line broadening, plasmas; Stark Effect; atomic physics; collisions; line shapes; random processes; memory loss mechanisms

Special Issue Information

Dear Colleagues,

The Spectral Line Shapes in Plasma (SLSP) code comparison workshop series [1] has provided a forum for the fruitful introduction, refinement, and testing of ideas and computational methods, applied to suitably chosen test cases for line shape computations in plasmas, which, among other things, is very important for diagnostics of laboratory and astrophysical plasmas. Five meetings have been held thus far—in 2012, 2013, 2015, 2017, and 2019.

Selected topics from the first two workshops were published in an Atoms Special Issue [2], with a second Special Issue [3] covering topics from the 3rd and 4th SLSP. The present Special Issue mostly covers topics either directly from the 5th SLSP or topics that emerged from the many fruitful discussions during the meeting, such as large magnetic fields and isolated lines. As usual, the present Special Issue is meant to address a number of current research topics, and to publish contributions from the wider community working on diverse aspects of calculations of spectral line shapes in plasma.

References

  1. http://plasmagate.weizmann.ac.il/SLSP/
  2. https://0-www-mdpi-com.brum.beds.ac.uk/journal/atoms/special_issues/SpectralLineShapes
  3. https://0-www-mdpi-com.brum.beds.ac.uk/journal/atoms/special_issues/spectral_line_shapes_II

Dr. Spiros Alexiou
Guest Editor

Manuscript Submission Information

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Keywords

  • Stark broadening in plasmas
  • Electron broadening in isolated lines
  • Spectral line profiles in plasmas with large magnetic fields
  • Statistical Aspects Laboratory plasmas
  • Astrophysical plasmas

Published Papers (5 papers)

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Research

Open AccessArticle
Stark-Broadening of Ar K-Shell Lines: A Comparison between Molecular Dynamics Simulations and MERL Results
Atoms 2021, 9(1), 9; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms9010009 - 25 Jan 2021
Viewed by 530
Abstract
Analysis of Stark-broadened spectral line profiles is a powerful, non-intrusive diagnostic technique to extract the electron density of high-energy-density plasmas. The increasing number of applications and availability of spectroscopic measurements have stimulated new research on line broadening theory calculations and computer simulations, and [...] Read more.
Analysis of Stark-broadened spectral line profiles is a powerful, non-intrusive diagnostic technique to extract the electron density of high-energy-density plasmas. The increasing number of applications and availability of spectroscopic measurements have stimulated new research on line broadening theory calculations and computer simulations, and their comparison. Here, we discuss a comparative study of Stark-broadened line shapes calculated with computer simulations using non-interacting and interacting particles, and with the multi-electron radiator line shape MERL code. In particular, we focus on Ar K-shell X-ray line transitions in He- and H-like ions, i.e., Heα, Heβ and Heγ in He-like Ar and Lyα, Lyβ and Lyγ in H-like Ar. These lines have been extensively used for X-ray spectroscopy of Ar-doped implosion cores in indirect- and direct-drive inertial confinement fusion (ICF) experiments. The calculations were done for electron densities ranging from 1023 to 3×1024 cm3 and a representative electron temperature of 1 keV. Comparisons of electron broadening only and complete line profiles including electron and ion broadening effects, as well as Doppler, are presented. Overall, MERL line shapes are narrower than those from independent and interacting particles computer simulations performed at the same conditions. Differences come from the distinctive treatments of electron broadening and are more pronounced in α line transitions. We also discuss the recombination broadening mechanism that naturally emerges from molecular dynamics simulations and its influence on the line shapes. Furthermore, we assess the impact of employing either molecular dynamics or MERL line profiles on the diagnosis of core conditions in implosion experiments performed on the OMEGA laser facility. Full article
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Open AccessArticle
Stark-Zeeman Broadening of Spectral Line Shapes in Magnetized Plasmas
Atoms 2020, 8(4), 91; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms8040091 - 04 Dec 2020
Viewed by 618
Abstract
In this work, we studied the Lyman-alpha line in the presence of a magnetic field, such as the ones found at the edge of tokamaks. The emphasis is on the contribution of the motional Stark effect on line broadening, which may have comparable [...] Read more.
In this work, we studied the Lyman-alpha line in the presence of a magnetic field, such as the ones found at the edge of tokamaks. The emphasis is on the contribution of the motional Stark effect on line broadening, which may have comparable effects to the internal plasma microfields for the spectral line in question. The effect of the magnetic field, temperature, and the Maxwell distribution of the ion velocities and density on Lyman-alpha are studied. Full article
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Open AccessArticle
On the Stark Effect of the O I 777-nm Triplet in Plasma and Laser Fields
Atoms 2020, 8(4), 84; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms8040084 - 20 Nov 2020
Viewed by 549
Abstract
The O I 777-nm triplet transition is often used for plasma density diagnostics. It is also employed in nonlinear optics setups for producing quasi-comb structures when pumped by a near-resonant laser field. Here, we apply computer simulations to situations of the radiating atom [...] Read more.
The O I 777-nm triplet transition is often used for plasma density diagnostics. It is also employed in nonlinear optics setups for producing quasi-comb structures when pumped by a near-resonant laser field. Here, we apply computer simulations to situations of the radiating atom subjected to the plasma microfields, laser fields, and both perturbations together. Our results, in particular, resolve a controversy related to the spectral line anomalously broadened in some laser-produced plasmas. The importance of using time-dependent density matrix is discussed. Full article
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Open AccessArticle
Hydrogen Line Shapes in Plasmas with Large Magnetic Fields
Atoms 2020, 8(4), 74; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms8040074 - 15 Oct 2020
Viewed by 619
Abstract
We report on hydrogen line shape calculations in the presence of an external magnetic field, at conditions such that the quadratic Zeeman effect is important. The latter is described through a term proportional to B2 in the Hamiltonian, accounting for atomic diamagnetism. [...] Read more.
We report on hydrogen line shape calculations in the presence of an external magnetic field, at conditions such that the quadratic Zeeman effect is important. The latter is described through a term proportional to B2 in the Hamiltonian, accounting for atomic diamagnetism. It provides a shift and an asymmetry on Lorentz triplets, and it leads to the occurrence of forbidden components. Motivated by investigations performed at the fifth edition of the Spectral Line Shape in Plasmas (SLSP5) code comparison workshop, we perform new calculations of hydrogen Lyman line profiles. Field values representative of magnetized white dwarf atmosphere conditions are taken. The calculations are done using a computer simulation technique, designed for Stark broadening modeling. A discussion of the results is done in the framework of plasma diagnostics. Full article
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Open AccessArticle
Theoretical Stark Broadening Parameters for UV–Blue Spectral Lines of Neutral Vanadium in the Solar and Metal-Poor Star HD 84937 Spectra
Atoms 2020, 8(4), 64; https://0-doi-org.brum.beds.ac.uk/10.3390/atoms8040064 - 28 Sep 2020
Cited by 1 | Viewed by 548
Abstract
Using Griem’s semi-empirical approach, we have calculated the Stark broadening parameters (line widths and shifts) of 35 UV–Blue spectral lines of neutral vanadium (V I). These lines have been detected in the Sun, the metal-poor star HD 84937, and Arcturus, among others. In [...] Read more.
Using Griem’s semi-empirical approach, we have calculated the Stark broadening parameters (line widths and shifts) of 35 UV–Blue spectral lines of neutral vanadium (V I). These lines have been detected in the Sun, the metal-poor star HD 84937, and Arcturus, among others. In addition, these parameters are also relevant in industrial and laboratory plasma. The matrix elements required were obtained using the relativistic Hartree–Fock (HFR) method implemented in Cowan’s code. Full article
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