We lay out a unified formalism for the description of radiative electron capture into excited states of heavy, few-electron ions and their subsequent decay, including a full account of many-electron effects and higher-order multipoles of the radiation field. In particular, the density-matrix theory is applied to explore the magnetic sublevel population of the residual ions, as described in terms of alignment parameters. For the electron capture into the initially hydrogenlike U91+ and lithiumlike U89+ uranium projectiles, the alignment parameters are calculated, within the multiconfiguration Dirac-Fock approach, as a function of the collision energy and for different ionic states. From these calculations, we find that the many-electron interactions may result in a small enhancement of the alignment, and that this effect becomes more pronounced for highly excited levels.
A. S. Surzhykov et al., "Radiative Electron Capture into High- Z Few-Electron Ions: Alignment of the Excited Ionic States," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 73, no. 3, pp. 032716-1-032716-8, American Physical Society (APS), Mar 2006.
The definitive version is available at https://doi.org/10.1103/PhysRevA.73.032716
Keywords and Phrases
Excited Ionic States; Multiconfiguration Dirac-Fock Approach; Radiative Electron Capture; Uranium Projectiles; Electron Density Measurement; Electrons; Negative Ions; Positive Ions; Radiation; Energy Levels
International Standard Serial Number (ISSN)
Article - Journal
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