Collision Strengths of Astrophysical Interest for Multiply Charged Ions
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, howev...
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MDPI AG
2023-05-01
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| author | Stephan Fritzsche Li-Guang Jiao Yuan-Cheng Wang Jozef E. Sienkiewicz |
| author_facet | Stephan Fritzsche Li-Guang Jiao Yuan-Cheng Wang Jozef E. Sienkiewicz |
| author_sort | Stephan Fritzsche |
| collection | DOAJ |
| description | 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, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>kin</mi></msub><mspace width="0.166667em"></mspace><mo>≲</mo><mspace width="0.166667em"></mspace><mn>5000</mn></mrow></semantics></math></inline-formula> eV of the free incident electron. To further explore the role of impact excitation, we here expanded <span style="font-variant: small-caps;">Jac</span>, 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. |
| first_indexed | 2024-03-11T03:56:40Z |
| format | Article |
| id | doaj.art-62c811509806414e82a5706afe04ec66 |
| institution | Directory Open Access Journal |
| issn | 2218-2004 |
| language | English |
| last_indexed | 2024-03-11T03:56:40Z |
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| spelling | doaj.art-62c811509806414e82a5706afe04ec662023-11-18T00:26:43ZengMDPI AGAtoms2218-20042023-05-011158010.3390/atoms11050080Collision Strengths of Astrophysical Interest for Multiply Charged IonsStephan Fritzsche0Li-Guang Jiao1Yuan-Cheng Wang2Jozef E. Sienkiewicz3Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, GermanyHelmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, GermanyHelmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, GermanyFaculty of Applied Physics and Mathematics and Advanced Materials Center, Gdańsk University of Technology, 80-233 Gdańsk, PolandThe 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, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>E</mi><mi>kin</mi></msub><mspace width="0.166667em"></mspace><mo>≲</mo><mspace width="0.166667em"></mspace><mn>5000</mn></mrow></semantics></math></inline-formula> eV of the free incident electron. To further explore the role of impact excitation, we here expanded <span style="font-variant: small-caps;">Jac</span>, 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.https://www.mdpi.com/2218-2004/11/5/80atomic structure(effective) collision strengthdistorted waveelectron impact excitationfine-structure-resolvedJena Atomic Calculator |
| spellingShingle | Stephan Fritzsche Li-Guang Jiao Yuan-Cheng Wang Jozef E. Sienkiewicz Collision Strengths of Astrophysical Interest for Multiply Charged Ions Atoms atomic structure (effective) collision strength distorted wave electron impact excitation fine-structure-resolved Jena Atomic Calculator |
| title | Collision Strengths of Astrophysical Interest for Multiply Charged Ions |
| title_full | Collision Strengths of Astrophysical Interest for Multiply Charged Ions |
| title_fullStr | Collision Strengths of Astrophysical Interest for Multiply Charged Ions |
| title_full_unstemmed | Collision Strengths of Astrophysical Interest for Multiply Charged Ions |
| title_short | Collision Strengths of Astrophysical Interest for Multiply Charged Ions |
| title_sort | collision strengths of astrophysical interest for multiply charged ions |
| topic | atomic structure (effective) collision strength distorted wave electron impact excitation fine-structure-resolved Jena Atomic Calculator |
| url | https://www.mdpi.com/2218-2004/11/5/80 |
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