Radiative electron capture into high-Z few-electron ions: Alignment of the excited ionic states

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Andrey Surzhykov and Ulrich D. Jentschura
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany

Thomas Stöhlker
Gesellschaft für Schwerionenforschung (GSI), D-64291 Darmstadt, Germany and Institut für Kernphysik, Universität Frankfurt, D-60486 Frankfurt, Germany

Stephan Fritzsche
Institut für Physik, Universität Kassel, D-34132 Kassel, Germany

Received 18 November 2005; revised 17 January 2006; published 17 March 2006

Welay out a unified formalism for the description of radiativeelectron capture into excited states of heavy, few-electron ions andtheir subsequent decay, including a full account of many-electron effectsand higher-order multipoles of the radiation field. In particular, thedensity-matrix theory is applied to explore the magnetic sublevel populationof the residual ions, as described in terms of alignmentparameters. 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 thecollision energy and for different ionic states. From these calculations,we find that the many-electron interactions may result in asmall enhancement of the alignment, and that this effect becomesmore pronounced for highly excited levels.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.032716
DOI:	10.1103/PhysRevA.73.032716
PACS:	34.70.+e; 31.25.-v; 31.30.Jv 34.70.+e Charge transfer (atoms and molecules) 31.25.-v Electron correlation calculations for atoms and molecules 31.30.Jv Relativistic and quantum electrodynamic effects in atoms and molecules YEAR: 2006
KEYWORDS:	uranium, electron capture, positive ions, excited states, Dirac-Fock calculations

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