Distorted-wave calculations of cross sections for electron-impact ionization of lithiumlike ions
- High Temperature Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
We used distorted-wave and multiconfigurational Dirac-Fock methods to calculate direct and indirect contributions to cross sections for electron-impact ionization of C{sup 3+}, N{sup 4+}, O{sup 5+}, and F{sup 6+}. The features due to excitation autoionization and resonant excitation double autoionization observed in recent cross-beam measurements (G. Hofmann {ital et} {ital al}., Z. Phys. D 16, 113 (1990)) are well reproduced in our results. Our cross sections are also in good agreement with reported results of nonrelativistic close-coupling calculations (S. S. Tayal and R. J. W. Henry, Phys, Rev. A 42, 1831 (1990); 44, 2955 (1991)) over most of the energy range studied. We examine the effects of radiative decay on the intermediate states, and we show that neglect of certain channels in the close-coupling calculation results in overestimation of the cross sections in the region of the 1{ital s}2{ital s}2{ital pnl} resonances.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7043697
- Journal Information:
- Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:7; ISSN 1050-2947; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Distorted-wave cross sections for electron-impact ionization of Ar{sup 7+}
Contribution of excitation autoionization to the electron-impact ionization of Ar{sup 7+}