Radiative Recombination Plasma Rate Coefficients for Multiply Charged Ions

GND
124026982
ORCID
0000-0003-3101-2824
Affiliation
Helmholtz-Institut Jena,
Fritzsche, Stephan;
GND
1315772876
ORCID
0000-0002-1143-9209
Affiliation
Helmholtz-Institut Jena
Maiorova, Anna V.;
GND
1133365531
ORCID
0000-0002-4700-5605
Affiliation
Helmholtz-Institut Jena
Wu, Zhongwen

Radiative recombination (RR) plasma rate coefficients are often applied to estimate electron densities and temperatures under quite different plasma conditions. Despite their frequent use, however, these rate coefficients are available only for selected (few-electron) ions and isoelectronic sequences, mainly because of the computational efforts required. To overcome this limitation, we report here a (relativistic) cascade model which helps compute fine-structure and shell-resolved as well as total RR plasma rate coefficients for many, if not most, elements of the periodic table. This model is based on Jac , the Jena Atomic Calculator, and supports studies on how the electron is captured in selected levels of the recombined ion, a relativistic (Maxwellian) electron distribution, or how the multipoles beyond the electric-dipole field in the electron-photon interaction affect the RR rate coefficients and, hence, the ionization and recombination dynamics of hot plasma. As a demonstration of this model, we compute, compare, and discuss different RR plasma rate coefficients for initially helium-like ions, with an emphasis especially on Fe 24 + ions.

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