# Plasma environment effects on K lines of astrophysical interest I. Atomic structure, radiative rates and Auger widths of oxygen ions

## TL;DR

This study investigates how plasma environments influence the atomic structure and radiative properties of oxygen ions relevant to astrophysical phenomena, using advanced relativistic calculations to quantify changes in ionization and emission characteristics.

## Contribution

It introduces a novel application of the Debye-Huckel potential within the relativistic MCDF framework to assess plasma effects on oxygen ion K-vacancy states.

## Key findings

- Modified ionization potentials and K thresholds in plasma environments.
- Altered Auger widths and radiative transition wavelengths and rates.
- Quantitative data across a range of plasma temperatures and densities.

## Abstract

Aims. In the context of black-hole accretion disks, the main goal of the present study is to estimate the plasma environment effects on the atomic structure and radiative parameters associated with the K-vacancy states in ions of the oxygen isonuclear sequence. Methods. We use a time-averaged Debye-Huckel potential for both the electron-nucleus and the electron-electron interactions implemented in the fully relativistic multiconfiguration Dirac-Fock (MCDF) method. Results. Modified ionization potentials, K thresholds, Auger widths and radiative transition wavelengths and rates are reported for O I - O VII in plasma environments with electron temperature and density ranges 10E5 - 10E7 K and 10E18 - 10E22 cm-3 .