Mikhail Vronskiy | Searcharxiv

arXiv2025

Fourier Transform Method Of A Detailed Configuration Accounting In Hot Plasma Bound-Bound Opacity Calculations

G.~Hazak and J.~Kurzweil discovered a method of configurational resolution of transition arrays for the Super Transition Arrays approach to the bound-bound opacity calculation. Their method is based on the representation of the photoabsorption coefficient as the Fourier transform, the linearity of the transition energy between configurations with respect to shell occupation numbers, and factorization of the probabilities of configurations on shell occupation numbers. We extend the Hazak -- Kurzweil method for the calculations with Detailed Configuration Accounting. The resulting expressions for the bound-bound opacity represent an alternative to the widely used ones and are quite convenient for numerical implementation.

physics.plasm-ph↗

arXiv2025

A Detailed Configuration Accounting for the Hot Plasma Bound-Free Opacity Calculation

The calculation of the hot plasma bound-free opacity according to the average atom models often leads to a noticeable effect of initial configuration on the shell ionization threshold. For the related problem of taking into account the impact of configurations while calculating bound-bound opacity, G. Hazak and Y. Kurzweil developed a method within the Super Transition Arrays approach. Fourier transform method is the adaptation of their method for a Detailed Configurations Accounting. The bound--free opacity coefficient qualitative behavior makes it somewhat difficult to construct a direct analogue of Fourier transform method of Detailed Configurations Accounting for its calculation. We use the probabilistic reformulation of the method to obtain the expressions for the bound--free opacity coefficient that take into account the spread of ionization thresholds due to the shell occupation numbers fluctuations.

physics.plasm-ph↗