Collision Strengths of Astrophysical Interest for Multiply Charged Ions

Author:

Fritzsche Stephan123ORCID,Jiao Li-Guang124ORCID,Wang Yuan-Cheng125,Sienkiewicz Jozef E.6ORCID

Affiliation:

1. Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany

2. GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany

3. Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany

4. College of Physics, Jilin University, Changchun 130012, China

5. College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China

6. Faculty of Applied Physics and Mathematics and Advanced Materials Center, Gdańsk University of Technology, 80-233 Gdańsk, Poland

Abstract

The electron impact excitation and ionization processes are crucial for modeling the spectra of different astrophysical objects, from atmospheres of late-type stars to remnants of supernovae and up to the light emission from neutron star mergers, to name just a few. Despite their significance, however, little is known quantitatively about these processes for low- and medium-impact energies of, say, Ekin≲5000 eV of the free incident electron. To further explore the role of impact excitation, we here expanded Jac, the Jena Atomic Calculator, to the computation of distorted wave collision strengths for fine-structure-resolved, as well as configuration-averaged transitions. While we excluded the formation of dielectronic resonances, these tools can be readily applied for ions with a complex shell structure and by including the major relativistic contributions to these strengths. Detailed computations of the collision strengths are shown and explained for the impact excitation of lithium- and chlorine-like ions. When compared with other, well-correlated methods, good agreement was found, and hence, these tools will support studies of effective collision strengths for a wide range of electron impact energies, levels, and ionic charge states.

Publisher

MDPI AG

Subject

Condensed Matter Physics,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics

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