Interacting resonance effects along an isoelectronic sequence: Electron-impact excitation of Mg-like ions
- Department of Physics and Applied Physics, University of Strathclyde, Glasgow G40NG (United Kingdom)
- Department of Physics, Rollins College, Winter Park, Florida 32789 (United States)
- Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)
We have carried out a series of isolated-resonance and [ital R]-matrix close-coupling calculations for the electron-impact excitation of the 3[ital s][sup 2] [sup 1][ital S][r arrow]3[ital s]3[ital p] [sup 3][ital P] transition in the Mg-like ions Ar[sup 6+], Ti[sup 10+], Fe[sup 14+], and Se[sup 22+]. We obtain good agreement between the results of the two theoretical methods for three-state calculations, i.e., for the description of just a single Rydberg series of resonances. However, when two or more Rydberg series are present we observe large differences, due to interacting resonance effects, over a wide range of energies for all of the ions examined. For the case of Fe[sup 14+], we have continued the perturbative studies of interacting resonances of Griffin [ital et] [ital al]. [Phys. Rev. Lett. 72, 3491 (1994)] and also find the predominant effect to be due to direct configuration interaction between the resonant states rather than being due to their coupling through a common continuum. Our inclusion of these interacting resonance effects removes the major discrepancies between the perturbative and nonperturbative results for Fe[sup 14+] reported previously [Badnell [ital et] [ital al]., Phys. Rev. A 48, R2519 (1993)]. This is of importance for the study of indirect processes which are strongly radiation damped, for which the perturbative approach is widely used and the standard formulation of the close-coupling approximation is not applicable.
- DOE Contract Number:
- FG05-93ER54218; FG05-86ER53217
- OSTI ID:
- 7270556
- Journal Information:
- Physical Review A; (United States), Vol. 50:2; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MULTICHARGED IONS
ELECTRON-ION COLLISIONS
CALCULATION METHODS
CROSS SECTIONS
EXCITATION
ISOELECTRONIC ATOMS
MAGNESIUM IONS
R MATRIX
RESONANCE
ATOMS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ENERGY-LEVEL TRANSITIONS
ION COLLISIONS
IONS
MATRICES
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)