Converged R-Matrix Calculations of the Photoionization of Fexvii in Astrophysical Plasmas: from Convergence to Completeness
Abstract
We use the relativistic distorted wave (RDW) method to complement (“top-up”) the photoionization cross sections of Fexvii obtained with the close-coupling Breit-Pauli R-Matrix (CC-BPRM) method. There is good agreement between RDW and BPRM for the background cross sections where resonances are not present, and the individual fine-structure levels can be correctly matched spectroscopically. To ensure completeness, we consider a high-energy tail up to 500 Ry above the ionization threshold for each level. The top-up contribution results in a 20% increment in addition to the 35% enhancement found in BPRM calculations relative to the Opacity Project value for the Rosseland mean opacity at the Z-temperature of 2.11×106 K.
- Publication:
-
Workshop on Astrophysical Opacities
- Pub Date:
- August 2018
- DOI:
- 10.48550/arXiv.1801.02188
- arXiv:
- arXiv:1801.02188
- Bibcode:
- 2018ASPC..515...89Z
- Keywords:
-
- Astrophysics - Solar and Stellar Astrophysics;
- Physics - Atomic and Molecular Clusters;
- Physics - Atomic Physics
- E-Print:
- 5 pages, 2 figures, Proc. Workshop on Astrophysical Opacities 2017, PASP