The structure of the autoionizing p5ds configurations in Mg II, Ca II, Sr II and Ba II and interpretation of electron impact cross sections for these ions
- 1 December 1975
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 8 (17) , 2759-2770
- https://doi.org/10.1088/0022-3700/8/17/007
Abstract
Recent identifications of autoionizing thresholds in the cross section for electron impact excitation of the ground state of Ba II as being due to levels in the p5ds configuration have been extended to Ca II and Sr II. A new result is that the most prominent threshold is due to exchange. The energy calculations are improved by taking the p5ds from or to p5l2 interactions (l=s, p' and d) into account. For the 2P terms, the influence of these interactions is found to be fairly small. The exception is Mg II for which the interacting configurations belong to the same complex. The importance of this result for the analysis of inner-shell absorption spectra in the Na I isoelectronic sequence is pointed out.Keywords
This publication has 19 references indexed in Scilit:
- Autoionization Spectra of Magnesium (Mg i, MG ii, and MG Iii) in the 50- to 110-eV Energy RangeThe Astrophysical Journal, 1974
- Identification of autoionization thresholds in the cross section for electron ionization of Ba+Journal of Physics B: Atomic and Molecular Physics, 1974
- A multi-configuration Hartree-Fock program with improved stabilityComputer Physics Communications, 1972
- Hartree-Fock predictions of the1P term in the p5d configurations of the spectra in the Ar I and Kr I isoelectronic sequencesJournal of Physics B: Atomic and Molecular Physics, 1972
- Autoionization structure in the ionization of Ba+by electron impactJournal of Physics B: Atomic and Molecular Physics, 1971
- Absorption Spectrum of NA i in the Vacuum UltravioletThe Astrophysical Journal, 1971
- The structure of the ionization curves of the sodium-like ionsJournal of Physics B: Atomic and Molecular Physics, 1968
- Coupling Considerations in Two-Electron Spectra*Journal of the Optical Society of America, 1965
- L'excitation des atomes par chocs électroniquesAnnales de Physique, 1963
- The Interaction of Configurations:Physical Review B, 1933