Electron-impact ionization of Fe3+

A Kynienė,V Jonauskas,S Kučas,S Pakalka,Š Masys

doi:10.1088/1742-6596/1412/15/152053

A Kynienė, V Jonauskas + Show 3 more

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https://doi.org/10.1088/1742-6596/1412/15/152053

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Abstract

SynopsisElectron-impact ionization cross sections are studied for levels of the ground and first excited con-figurations of the Fe3+ ion. Convergence for the excitation-autoionization cross sections due to excitations to the high-nl shells is investigated. Single configuration and configuration interaction methods are used in the study. Scaling is applied to the distorted wave cross sections of the excitation-autoionization and collisional ionization processes.

Highlights

Spectroscopic data provided by the Chandra, XMM-Newton, Solar and Heliospheric Observatory (SOHO), and Hinode satellites opened new opportunities to study astrophysical objects
We demonstrate that excitations to the subshells with orbital quantum number l = 3 with subsequent autoionization dominate up to electron energies of ∼700 eV for the ground and metastable levels
The study demonstrates that excitations to subshells with orbital quantum number l = 3 dominate for the ground and metastable levels of the Fe8+ ion at the lower energy side

Summary

Introduction

Spectroscopic data provided by the Chandra, XMM-Newton, Solar and Heliospheric Observatory (SOHO), and Hinode satellites opened new opportunities to study astrophysical objects. First measurements of the electron-impact ionization cross sections for iron were started by analysing the Fe+ ions (Montague et al 1984). The crossed beams technique was used in the study Later, this approach was applied to analyse the Fe2+ ion (Mueller et al 1985). The cross sections for Fe5+, Fe6+, Fe9+, Fe11+, and Fe13+ were calculated by applying the configurationaverage DW (CADW) method by Pindzola et al (1986) They provided values for the DI and EA processes that explained previous disagreements with measurements (Gregory et al 1986). The calculations for the electron-impact ionization cross sections and plasma rate coefficients were extended for the iron isonuclear sequence (Pindzola et al 1987). The electron-impact single ionization cross sections for Feq+ (q = 1−6, 9, 10) were measured by employing the animated crossed beams technique (Stenke et al 1999). The cross sections for Fe1+, Fe2+, Fe3+, and Fe4+ ions were produced using the CADW method (Pindzola & Loch 2018)

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