Special Issue "Photoionization of Atoms"

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

Deadline for manuscript submissions: 31 December 2022.

Special Issue Editors

Prof. Dr. Sultana N. Nahar
E-Mail Website
Guest Editor
Astronomy Department, The Ohio State University, Columbus, OH 43210, USA
Interests: photoionization; electron-ion recombination; photo-excitations; electron impact excitation; spectroscopy; X-ray spectroscopy for atomic processes and biomedical applications; database
Prof. Dr. Guillermo Hinojosa
E-Mail Website
Guest Editor
Instituto de Ciencias Físicas, National Autonomous University of Mexico (UNAM), Cuernavaca 62200, Mexico
Interests: atomic, molecular and optical physics; photoionization of ions; negative ions; fundamental processes in low temperature plasma

Special Issue Information

Dear Colleagues,

Photoionization of an atom or ion is one most common processes involving the interaction of a photon with an atom. It is one of the four most dominant atomic processes, along with photo-excitation, electron-ion recombination, and electron impact excitations, in astrophysical plasmas that produce the spectra and hence carries considerable information about the constituent elements and their abundances, plasma opacity, ionization fractions, etc. This special issue will present the precise underlying science of photoionization. Although direct photoionization via absorption of a photon by the atomic system happens, resonances form in the process as the energy of the photon-atom system matches to that of a doubly excited state, known as the autoionizing state, lying above the ionization threshold. It is inherent to study the process with inclusion of resonances. The objective of this issue is to advance the current understanding of atomic photoionization, both theoretically and experimentally, for complex atomic systems with demonstrations of various features in the low and high energy regions, that will impact the accuracy of photoionization environments, modeling of astrophysical and laboratory plasmas and their applications.

Prof. Dr. Sultana N. Nahar
Prof. Guillermo Hinojosa
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 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 1400 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

  • photoionization
  • experimental features
  • theoretical features
  • benchmarking
  • astrophysical applications

Published Papers (1 paper)

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Research

Article
Photoionization and Electron-Ion Recombination of n = 1 to Very High n-Values of Hydrogenic Ions
Atoms 2021, 9(4), 73; https://doi.org/10.3390/atoms9040073 - 03 Oct 2021
Viewed by 246
Abstract
Single electron hydrogen or hydrogenic ions have analytical forms to evaluate the atomic parameters for the inverse processes of photoionization and electron-ion recombination (H I + hν H II + e) where H is hydrogen. Studies of these processes have continued [...] Read more.
Single electron hydrogen or hydrogenic ions have analytical forms to evaluate the atomic parameters for the inverse processes of photoionization and electron-ion recombination (H I + hν H II + e) where H is hydrogen. Studies of these processes have continued until the present day (i) as the computations are restricted to lower principle quantum number n and (ii) to improve the accuracy. The analytical expressions have many terms and there are numerical instabilities arising from cancellations of terms. Strategies for fast convergence of contributions were developed but precise computations are still limited to lower n. This report gives a brief review of the earlier precise methodologies for hydrogen, and presents numerical tables of photoionization cross sections (σPI), and electron-ion recombination rate coefficients (αRC) obtained from recombination cross sections (σRC) for all n values going to a very high value of 800. σPI was obtained using the precise formalism of Burgess and Seaton, and Burgess. αRC was obtained through a finite integration that converge recombination exactly as implemented in the unified method of recombination of Nahar and Pradhan. Since the total electron-ion recombination includes all levels for n = 1 , the total asymptotic contribution of n=801, called the top-up, is obtained through a n3 formula. A FORTRAN program “hpxrrc.f” is provided to compute photoionization cross sections, recombination cross sections and rate coefficients for any nl. The results on hydrogen atom can be used to obtain those for any hydrogenic ion of charge z through z-scaling relations provided in the theory section. The present results are of high precision and complete for astrophysical modelings. Full article
(This article belongs to the Special Issue Photoionization of Atoms)
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