Contribution of high-nl shells to electron-impact ionization processes
Abstract
The contribution to electron-impact ionization cross sections from excitations to high-nl shells and a consequent autoionization is investigated. We perform relativistic subconfiguration-average and detailed level-to-level calculations for this process. Ionization cross sections for the W27+ ion are presented to illustrate the large influence of the high shells (n >= 9) and orbitals (l >= 4) in the excitation-autoionization process. The obtained results show that the excitations to the high shells (n >= 9) increase cross sections of the indirect ionization process by a factor of 2 compared to the excitations to the lower shells (n <= 8). The excitations to the shells with orbital quantum number l = 4 give the largest contribution comparedwith the other orbital quantum numbers l. Radiative damping reduces the cross sections of the indirect process approximately twofold in the case of the level-to-level calculations. Determined data show that the excitation-autoionization process contributes approximately 40% to the total ionization cross sections.
Keywords
Cite
@article{arxiv.1512.00287,
title = {Contribution of high-nl shells to electron-impact ionization processes},
author = {V. Jonauskas and A. Kynienė and G. Merkelis and G. Gaigalas and R. Kisielius and S. Kučas and Š. Masys and L. Radžiūtė and P. Rynkun},
journal= {arXiv preprint arXiv:1512.00287},
year = {2015}
}
Comments
18 pages including 6 figures and 2 tables