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13th International Colloquium on Atomic Spectra and Oscillator Strengths for...
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13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas

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

Deadline for manuscript submissions: closed (15 November 2019) | Viewed by 22603

Printed Edition Available!
A printed edition of this Special Issue is available here.

Special Issue Editors

Prof. Dr. Tomas Brage

E-Mail Website
Guest Editor
Division of Mathematical Physics, Department of Physics, Lund University, Box 118, SE - 221 00 Lund, Sweden
Interests: astrophysics; atomic physics; atomic spectroscopy; spectral analysis; plasma diagnostics; ab initio calculations
Prof. Dr. Roger Hutton

E-Mail Website
Guest Editor
Department of Astronomy, Beijing Normal University, Beijing 100875, China
Interests: photon spectroscopy of highly charged ions with applications in plasma diagnostics
Special Issues, Collections and Topics in MDPI journals
Dr. Jun Xiao

E-Mail Website
Guest Editor
Institute of Modern Physics, Fudan University, Shanghai 200433, China
Interests: atomic spectroscopy; atomic physics; tungsten; highly charged ions

Special Issue Information

Dear Colleagues,

(1) The main goal of the ASOS conferences is to bring together ‘producers’ and ‘users’ of atomic data so as to ensure optimal coordination. Atomic physicists who study the structure of atoms and their radiative and collisional properties will be invited to explain the development of their work, while astrophysicists and laboratory plasma physicists will be invited to review their present research interests and the context in which atomic data are needed. The symposium will be help at Fudan University, Shanghai, China between 23rd and 27th June 2019.

 (2) This Special Issue will provide an up-to-date reference to the current standing on atomic days for fusion and astrophysical plasma research, providing information on what data are available and what is also needed for future plasma diagnostics.

Prof. Dr. Tomas Brage
Prof. Dr. Roger Hutton
Dr. Jun Xiao
Guest Editors

Reference

  1. Special Issue on the 12th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas held at the Universidade de São Paulo on 4–7 July, Canadian Journal of Physics, Volume 95, Number 9 (2017)

 

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Atoms is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 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

  • Atomic lifetime and oscillator strength determination
  • Hyperfine structure and isotope shifts
  • Theoretical modeling and computational approaches
  • Laboratory techniques
  • High resolution spectroscopy
  • Trapped ions
  • Tests of fundamental constants
  • Highly charged ions
  • Collisional processes
  • Atomic databases and related topics
  • Astrophysical and laboratory plasmas: atomic data needs
  • Spectroscopic diagnostics of fusion plasmas
  • Topics in astrophysics including elemental abundance determination
  • Atomic spectra from HED plasmas and polarization

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Published Papers (7 papers)

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Editorial

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3 pages, 15805 KiB  
Editorial
The 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas
by Jun Xiao, Tomas Brage and Roger Hutton
Atoms 2020, 8(3), 43; https://doi.org/10.3390/atoms8030043 - 11 Aug 2020
Viewed by 2126
Abstract
The 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas (ASOS2019), co-hosted by Fudan and Lund Universities, was held at Fudan University from 23–27 June 2019 [...] Full article
(This article belongs to the Special Issue 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas)
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Research

Jump to: Editorial

7 pages, 332 KiB  
Article
Atomic Data Needs in Astrophysics: The Galactic Center “Scandium Mystery”
by Brian Thorsbro
Atoms 2020, 8(1), 4; https://doi.org/10.3390/atoms8010004 - 22 Jan 2020
Cited by 4 | Viewed by 2508
Abstract
Investigating the Galactic center offers unique insights into the buildup and history of our Galaxy and is a stepping stone to understand galaxies in a larger context. It is reasonable to expect that the stars found in the Galactic center might have a [...] Read more.
Investigating the Galactic center offers unique insights into the buildup and history of our Galaxy and is a stepping stone to understand galaxies in a larger context. It is reasonable to expect that the stars found in the Galactic center might have a different composition compared to stars found in the local neighborhood around the Sun. It is therefore quite exciting when recently there were reports of unusual neutral scandium, yttrium, and vanadium abundances found in the Galactic center stars, compared to local neighborhood stars. To explain the scandium abundances in the Galactic center, we turn to recent laboratory measurements and theoretical calculations done on the atomic oscillator strengths of neutral scandium lines in the near infrared. We combine these with measurements of the hyper fine splitting of neutral scandium. We show how these results can be used to explain the reported unusual scandium abundances and conclude that in this respect, the environment of the Galactic center is not that different from the environment in the local neighborhood around the sun. Full article
(This article belongs to the Special Issue 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas)
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16 pages, 916 KiB  
Article
New Energy Levels and Transitions of 5s25p2 (6d+7s) Configurations in Xe IV
by Jorge Reyna Almandos, Mónica Raineri, Cesar J. B. Pagan and Mario Gallardo
Atoms 2019, 7(4), 108; https://doi.org/10.3390/atoms7040108 - 17 Dec 2019
Cited by 1 | Viewed by 2626
Abstract
Three-times ionized xenon Xe IV spectrum in the 1070–6400 Å region was analyzed using a pulsed discharge light source. A set of 163 transitions was classified for the first time, and 36 new energy levels belonging to the 5s25p26d [...] Read more.
Three-times ionized xenon Xe IV spectrum in the 1070–6400 Å region was analyzed using a pulsed discharge light source. A set of 163 transitions was classified for the first time, and 36 new energy levels belonging to the 5s25p26d and 5s25p27s even configurations were determined. The relativistic Hartree–Fock method, including core-polarization effects, were used. In these calculations, the electrostatic parameters were optimized by a least-square procedure in order to improve the adjustment to experimental energy levels. We also present a calculation based on a relativistic multiconfigurational Dirac–Fock approach. Full article
(This article belongs to the Special Issue 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas)
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18 pages, 308 KiB  
Article
Charlotte Froese Fischer—Her Work and Her Impact
by Alan Hibbert
Atoms 2019, 7(4), 107; https://doi.org/10.3390/atoms7040107 - 17 Dec 2019
Cited by 2 | Viewed by 3939
Abstract
Charlotte Froese Fischer has been at the forefront of research in atomic structure theory for over 60 years. She has developed many of the methods currently used by researchers and has written associated computer programs which have been published and hence made accessible [...] Read more.
Charlotte Froese Fischer has been at the forefront of research in atomic structure theory for over 60 years. She has developed many of the methods currently used by researchers and has written associated computer programs which have been published and hence made accessible to the research community. Throughout her career, she has consistently encouraged and mentored young scientists, enabling them to embark on independent careers of their own. This article provides an overview of the methods and codes she has developed, some large-scale calculations she has undertaken, and some insight into the impact she has had on young scientists, and the leadership she continues to show as she reaches her 90th birthday. Full article
(This article belongs to the Special Issue 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas)
15 pages, 378 KiB  
Article
Coulomb (Velocity) Gauge Recommended in Multiconfiguration Calculations of Transition Data Involving Rydberg Series
by Asimina Papoulia, Jörgen Ekman, Gediminas Gaigalas, Michel Godefroid, Stefan Gustafsson, Henrik Hartman, Wenxian Li, Laima Radžiūtė, Pavel Rynkun, Sacha Schiffmann, Kai Wang and Per Jönsson
Atoms 2019, 7(4), 106; https://doi.org/10.3390/atoms7040106 - 26 Nov 2019
Cited by 25 | Viewed by 3605
Abstract
Astronomical spectroscopy has recently expanded into the near-infrared (nIR) wavelength region, raising the demands on atomic transition data. The interpretation of the observed spectra largely relies on theoretical results, and progress towards the production of accurate theoretical data must continuously be made. Spectrum [...] Read more.
Astronomical spectroscopy has recently expanded into the near-infrared (nIR) wavelength region, raising the demands on atomic transition data. The interpretation of the observed spectra largely relies on theoretical results, and progress towards the production of accurate theoretical data must continuously be made. Spectrum calculations that target multiple atomic states at the same time are by no means trivial. Further, numerous atomic systems involve Rydberg series, which are associated with additional difficulties. In this work, we demonstrate how the challenges in the computations of Rydberg series can be handled in large-scale multiconfiguration Dirac–Hartree–Fock (MCDHF) and relativistic configuration interaction (RCI) calculations. By paying special attention to the construction of the radial orbital basis that builds the atomic state functions, transition data that are weakly sensitive to the choice of gauge can be obtained. Additionally, we show that the Babushkin gauge should not always be considered as the preferred gauge, and that, in the computations of transition data involving Rydberg series, the Coulomb gauge could be more appropriate for the analysis of astrophysical spectra. To illustrate the above, results from computations of transitions involving Rydberg series in the astrophysically important C IV and C III ions are presented and analyzed. Full article
(This article belongs to the Special Issue 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas)
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11 pages, 1631 KiB  
Article
The Belgian Repository of Fundamental Atomic Data and Stellar Spectra (BRASS)
by Alex Lobel, Pierre Royer, Christophe Martayan, Michael Laverick, Thibault Merle, Mathieu Van der Swaelmen, Peter A. M. van Hoof, Marc David, Herman Hensberge and Emmanuel Thienpont
Atoms 2019, 7(4), 105; https://doi.org/10.3390/atoms7040105 - 22 Nov 2019
Cited by 2 | Viewed by 2974
Abstract
Background: BRASS (Belgian Repository of Fundamental Atomic Data and Stellar Spectra) is an international networking project for the development of a new public database providing accurate fundamental atomic data of vital importance for stellar spectroscopic research. We present an overview of research results [...] Read more.
Background: BRASS (Belgian Repository of Fundamental Atomic Data and Stellar Spectra) is an international networking project for the development of a new public database providing accurate fundamental atomic data of vital importance for stellar spectroscopic research. We present an overview of research results obtained in the past four years. Methods: The BRASS database offers atomic line data we thoroughly tested by comparing theoretical and observed stellar spectra. We perform extensive quality assessments of selected atomic input data using advanced radiative transfer spectrum synthesis calculations, which we compare to high-resolution Mercator-HERMES and ESO-VLT-UVES spectra of F-, G-, and K-type benchmark stars observed with very high signal-to-noise ratios. We have retrieved about half a million atomic lines required for our detailed spectrum synthesis calculations from the literature and online databases such as VAMDC, NIST, VALD, CHIANTI, Spectr-W 3 , TIPbase, TOPbase, SpectroWeb. Results: The atomic datasets have been cross-matched based on line electronic configuration information and organized in a new online repository called BRASS. The validated atomic data, combined with the observed and theoretical spectra are also interactively offered in BRASS. The combination of these datasets is a novel approach for its development providing a universal reference for advanced stellar spectroscopic research. Conclusion: We present an overview of the BRASS Data Interface developments allowing online user interaction for the combined spectrum and atomic data display, line identification, atomic data accuracy assessments including line log(gf)-values, and line equivalent width measurements. Full article
(This article belongs to the Special Issue 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas)
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14 pages, 3718 KiB  
Article
Orthogonal Operators: Applications, Origin and Outlook
by Peter Uylings and Ton Raassen
Atoms 2019, 7(4), 102; https://doi.org/10.3390/atoms7040102 - 13 Nov 2019
Cited by 8 | Viewed by 3172
Abstract
Orthogonal operators can successfully be used to calculate eigenvalues and eigenvector compositions in complex spectra. Orthogonality ensures least correlation between the operators and thereby more stability in the fit, even for small interactions. The resulting eigenvectors are used to transform the pure transition [...] Read more.
Orthogonal operators can successfully be used to calculate eigenvalues and eigenvector compositions in complex spectra. Orthogonality ensures least correlation between the operators and thereby more stability in the fit, even for small interactions. The resulting eigenvectors are used to transform the pure transition matrix into realistic intermediate coupling transition probabilities. Calculated transition probabilities for close lying levels illustrate the power of the complete orthogonal operator approach. Full article
(This article belongs to the Special Issue 13th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas)
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