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Atoms
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Atomic Processes in Plasmas: APiP-2019
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Atomic Processes in Plasmas: APiP-2019

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

Deadline for manuscript submissions: closed (23 June 2019) | Viewed by 9671

Special Issue Editors

Dr. Yuri Ralchenko

E-Mail Website
Guest Editor
Atomic Spectroscopy Group, Quantum Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
Interests: development of Internet atomic databases; high-precision atomic structure calculations; modeling of plasma population kinetics and other aspects of plasma spectroscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Alexander Kramida

E-Mail Website
Guest Editor
Atomic Spectroscopy Group, Physical Measurement Laboratory, Quantum Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8422, USA
Interests: atomic spectroscopy—critical evaluation of experimental and theoretical data on energy structure and radiative transitions in atoms and atomic ions; atomic spectroscopy databases
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will contain the invited and some contributed talks from the 20th International Conference on Atomic Processes in Plasmas that will be held at NIST, Gaithersburg MD from 9 to 12 April 2019.

Dr. Yuri Ralchenko
Dr. Alexander Kramida
Guest Editors

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 processes
  • plasma spectroscopy
  • warm dense matter
  • magnetic fusion
  • laser-produced plasmas
  • astrophysical spectroscopy

Published Papers (3 papers)

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Research

9 pages, 885 KiB  
Article
Dissociative Recombination of CH+ Molecular Ion Induced by Very Low Energy Electrons
by Zsolt J. Mezei, Michel D. Epée Epée, Ousmanou Motapon and Ioan F. Schneider
Atoms 2019, 7(3), 82; https://doi.org/10.3390/atoms7030082 - 19 Aug 2019
Cited by 9 | Viewed by 2712
Abstract
We used the multichannel quantum defect theory to compute cross sections and rate coefficients for the dissociative recombination of CH + initially in its lowest vibrational level v i + = 0 with electrons of incident energy below 0.2 eV. We have focused [...] Read more.
We used the multichannel quantum defect theory to compute cross sections and rate coefficients for the dissociative recombination of CH + initially in its lowest vibrational level v i + = 0 with electrons of incident energy below 0.2 eV. We have focused on the contribution of the 2 2 Π state which is the main dissociative recombination route at low collision energies. The final cross section is obtained by averaging the relevant initial rotational states ( N i + = 0 , ⋯ , 10 ) with a 300 K Boltzmann distribution. The Maxwell isotropic rate coefficients for dissociative recombination are also calculated for different initial rotational states and for electronic temperatures up to a few hundred Kelvins. Our results are compared to storage-ring measurements. Full article
(This article belongs to the Special Issue Atomic Processes in Plasmas: APiP-2019)
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9 pages, 294 KiB  
Article
Soft X-Ray Spectroscopy of Rare-Earth Elements in LHD Plasmas
by Chihiro Suzuki, Fumihiro Koike, Izumi Murakami, Naoki Tamura, Shigeru Sudo and Gerry O’Sullivan
Atoms 2019, 7(3), 66; https://doi.org/10.3390/atoms7030066 - 03 Jul 2019
Cited by 4 | Viewed by 3179
Abstract
Soft X-ray spectra from high Z rare-earth (lanthanide) elements have been systematically observed in optically thin, high-temperature plasmas produced in the Large Helical Device (LHD), a facility for magnetically confined fusion research. It has been demonstrated that the discrete and quasicontinuum (UTA) spectral [...] Read more.
Soft X-ray spectra from high Z rare-earth (lanthanide) elements have been systematically observed in optically thin, high-temperature plasmas produced in the Large Helical Device (LHD), a facility for magnetically confined fusion research. It has been demonstrated that the discrete and quasicontinuum (UTA) spectral features from highly charged lanthanide ions are observed depending on the plasma temperature. The analyses of the measured spectra are ongoing by comparisons with theoretical calculations and/or previous experimental data available. The discrete spectra recorded in high-temperature conditions are dominated by individual lines of Ge- to Ni-like ions, while prominent peaks in the narrowed UTA spectra observed in low-temperature conditions are well explained by the transitions of Ag- to Rh-like ions. Full article
(This article belongs to the Special Issue Atomic Processes in Plasmas: APiP-2019)
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17 pages, 12559 KiB  
Article
Laser-Plasma and Self-Absorption Measurements with Applications to Analysis of Atomic and Molecular Stellar Astrophysics Spectra
by Christian G. Parigger, Christopher M. Helstern and Ghaneshwar Gautam
Atoms 2019, 7(3), 63; https://doi.org/10.3390/atoms7030063 - 01 Jul 2019
Cited by 6 | Viewed by 3256
Abstract
This work discusses laboratory measurements of atomic and diatomic molecular species in laser-plasma generated in gases. Noticeable self-absorption of the Balmer series hydrogen alpha line occurs for electron densities of the order of one tenth of standard ambient temperature and pressure density. Emission [...] Read more.
This work discusses laboratory measurements of atomic and diatomic molecular species in laser-plasma generated in gases. Noticeable self-absorption of the Balmer series hydrogen alpha line occurs for electron densities of the order of one tenth of standard ambient temperature and pressure density. Emission spectra of selected diatomic molecules in air or specific gaseous mixtures at or near atmospheric pressure reveal minimal plasma re-absorption. Abel inversion of the plasma in selected gases and gas mixtures confirm expansion dynamics that unravel regions of atomic and molecular species of different electron temperature and density. Time resolved spectroscopy diagnoses self-absorption of hydrogen alpha and hydrogen beta lines in ultra-high pure hydrogen gas. Radiation from a Nd:YAG laser device induces micro-plasma for pulse widths in the range of 6–14 ns, energies in the range of 100–800 mJ, and peak irradiances of the order 1–10 TW/cm 2 . Atomic line profiles yield electron density and temperature from fitting of line profiles to wavelength and sensitivity corrected spectral radiance data. Analysis of measured diatomic emission data yields excitation temperature of primarily molecular recombination spectra. Applications of the laboratory experiments extend to investigations of stellar astrophysics white dwarf spectra. Full article
(This article belongs to the Special Issue Atomic Processes in Plasmas: APiP-2019)
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