Special Issue "Current Developments and Applications of Atomic Structure and Radiative Process Investigations"

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

Deadline for manuscript submissions: 30 June 2018

Special Issue Editor

Guest Editor
Dr. Pascal Quinet

Physique Atomique et Astrophysique, Université de Mons, B-7000 Mons, Belgium ; IPNAS, Université de Liège, B-4000 Liège, Belgium
Website | E-Mail
Interests: atomic physics; atomic structure; atomic spectra; radiative and collisional processes

Special Issue Information

Dear Colleagues,

The study of electronic structures and radiative processes in atoms, from neutrals to highly ionized species, has known a considerable development during the past few decades; new contributions arise from both experiment and theory. This appreciable progress was aided by greatly-improved, or even entirely-new, laboratory equipment, and by vastly expanded computer power, which has made possible the development of widely-refined atomic structure codes.

On the experimental side, the recent developments now allow measuring of atomic parameters with a very high accuracy. This is extremely useful to test the predictive power of theoretical models and to obtain a reliable absolute scale for spectroscopic data, such as radiative transition probabilities. Using laser spectroscopy, it is now possible to measure radiative lifetimes for excited atomic states with an accuracy of a few percent for many-electron atomic systems, thanks to the selective excitation avoiding cascading problems. In addition, the development of ion traps has opened the way towards new accurate experimental studies of much more acute effects on the atomic structures, such as hyperfine or isotope effects. Some derivatives of these devices, such as storage rings or electron-beam ion traps, are also in use. The former ones are very useful for the investigation of metastable states in lowly ionized atoms, of which lifetimes may range from milliseconds to years, while the latter ones are dedicated to the production and the analysis of highly charged ions.

On the theoretical side, an intense effort over the last few years has been directed toward developing methods to accurately and simultaneously account for relativistic and correlation effects in many-electron systems, both effects being intertwined in heavy atoms and ions. All the current state-of-the-art computational techniques developed for modeling complex atomic structures present the advantage of being complementary, since they employ different treatments of, for example, configuration interaction, relativistic effects and atomic orbital optimization. This complementarity offers a unique opportunity to assess the reliability of the theoretical results when experimental measurements are unavailable.

Accurate atomic structure and radiative data are essential ingredients for a wide range of research fields, as well as for major technological applications. Areas from laboratory spectroscopy to quantum processing, from plasma research applications in nuclear fusion to lighting research, as well as astrophysics and cosmology, critically depend on such data. However, many spectroscopic parameters still exhibit inconsistencies and inaccuracies, so significant efforts are continuing to improve data quality. Additionally, a substantial body of much-needed data is still absent from the published literature and from databases.

This Special Issue of Atoms will highlight the need for continuing studies on the atomic structures and radiative processes and will present some of the most recent theoretical and experimental works performed in this research field.

Dr. Pascal Quinet
Guest Editor

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 papers will be 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 quarterly 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 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

  • Atomic physics
  • atomic structure
  • atomic spectra
  • Energy levels
  • Radiative processes
  • Transition probabilities
  • Oscillator strengths
  • Radiative lifetimes
  • Hyperfine structure
  • Isotope shifts
  • Application of radiative data in astrophysics
  • Application of radiative data in plasma physics

Published Papers (1 paper)

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Research

Open AccessArticle Spectrum of Sn5+ in the Region 500–1300 Å
Atoms 2017, 5(4), 47; doi:10.3390/atoms5040047
Received: 3 October 2017 / Revised: 7 November 2017 / Accepted: 8 November 2017 / Published: 18 November 2017
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Abstract
The spectrum of tin, excited in a vacuum spark, was recorded in the region 500–1131 Å on a 6.65-m normal incidence spectrograph. The transitions between 4d85s, 4d86s, 4d85p and 4d85d excited configurations in Sn VI
[...] Read more.
The spectrum of tin, excited in a vacuum spark, was recorded in the region 500–1131 Å on a 6.65-m normal incidence spectrograph. The transitions between 4d85s, 4d86s, 4d85p and 4d85d excited configurations in Sn VI were studied. More than 500 lines of the 4d85p–4d85d and 4d85p–4d86s were identified with the aid of the Cowan code calculations. 67 energy levels (out of 70 possible levels of the 4d85d configuration) and all but two 4d86s levels were found. The wavelength of the 4d85s–4d85p transitions in the region 839–1131 Å were re-measured and supplemented by Sn VI lines in the region 1131–1300 Å measured previously by Srivastava et al. (1977) for optimisation of the energy level values. The SnVI line list in the region 500–1300 Å contains now 741 lines with calculated transition probabilities. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Name: Charlotte Froese Fischer 1;* and Gediminas Gaigalas 2

Abstract: The effect of correlation in atoms and ions of the lanthanides and actinides is not
well understood. In fact, very few spectra of these atoms and ions have been investigated.
The periodic table makes it clear that atomic structure changes, in that new shells appear
before an earlier shell is filled. In addition, the number of levels in of fn configurations in
the lanthanides and actinides, increases rapidly with n (n≤7) and resulting spectra consist
of numerous closely spaced levels. The simplest case has a 4f2 ground configuration with
thirteen levels. The lanthanides are among the lighter atomic systems where both correlation
and relativistic effects require a fully relativistic treatment. Some studies for Pr+3.

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