Magnetic Sublevel Population Studied for H- and He-like Uranium in Relativistic Ion–Atom Collisions

Gumberidze, A.; Stöhlker, Th.; Bednarz, G.; Bosch, F.; Fritzsche, S.; Hagmann, S.; Ionescu, D. C.; Klepper, O.; Kozhuharov, C.; Krämer, A.; Liesen, D.; Ma, Xiaoming; Mann, R.; Mokler, P. H.; Sierpowski, D.; Stachura, Z.; Steck, M.; Toleikis, S.; Warczak, A.

doi:10.1023/b:hype.0000004211.16029.0b

Cited by 11 publications

(15 citation statements)

References 6 publications

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“…In order to illustrate such an analysis, we now make use of equation (9) for studying the angular distribution of the Kα 1 (1s2p 3/2 J f = 1, 2 → 1s 2 J 0 = 0) radiation from helium-like uranium ions U 90+ produced by electron recombination. Experiments concerning this radiative decay have recently been performed at the GSI storage ring, and the angular distributions observed have been found to be qualitatively different from those of the Lyman-α 1 (2p 3/2 → 1s) decay in the hydrogen-like ions [19,26]. Namely, while the Lyman-α 1 radiation exhibited a strong angular dependence, the Kα 1 decay gave rise to an almost isotropic emission pattern.…”

Section: Isotropy Of the Kα 1 Radiation From The Helium-like Uranium mentioning

confidence: 97%

“…and helium-like U 90+ uranium ions [19,[24][25][26] as produced by the radiative recombination of the initially bare or, 28 The European Physical Journal D respectively, hydrogen-like ions. From the (measured) angular distribution of the Lyman-α 1 (2p 3/2 → 1s) and Kα 1 (1s 2p 3/2 → 1s…”

Section: +mentioning

confidence: 99%

“…2 ) photons and, hence, the alignment of the excited ions, valuable information was obtained not only about the dynamics of the electron capture processes [25,26] but also about the multipole mixing in heavy atomic systems [24,27].…”

Section: +mentioning

confidence: 99%

“…Since these parameters are tabulated in reference [28] for medium-and high-Z ions over a wide range of projectile energies, equation (9) provides a fast access to the alignment of few-electron ions as required often for the analysis of electron-capture experiments [19,26]. Note however, that equation (9) was obtained by omitting the electron-electron interaction effects and, hence, is an approximation.…”

Section: Alignment Parameters Within the Independent Particle Modelmentioning

confidence: 99%

“…Motivated by recent experimental studies [19,26], a number of theoretical works were done to calculate the alignment of helium-like and beryllium-like heavy ions produced by electron capture into excited ionic states [29,30]. Until now, most of the calculations have been performed within the framework of the multiconfiguration DiracFock approach which allows a systematic account for the interelectronic interaction effects.…”

Section: Alignment Of the Helium-and Beryllium-like Heavy Ionsmentioning

confidence: 99%

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Electron capture into few-electron heavy ions: Independent particle model

2007

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Abstract. We apply the density matrix theory to re-investigate the radiative electron capture into heavy ions with one valence electron. Attention has been paid particularly to the magnetic sublevel population of the residual ions, as described in terms of alignment parameters. Simple method, based on an independent particle model, which takes into account the Pauli principle, is proposed for evaluating the alignment of the excited ionic states. By making use of this method, detailed calculations are performed for electron capture into (initially) hydrogen-like and lithium-like europium, gold and uranium ions, and are compared with the results of the multiconfiguration Dirac-Fock approach.As seen from the calculations and from the comparison with available experimental results, the independent particle model provides a good estimate for the alignment parameters of few-electron heavy ions. Therefore, our simple model may help to understand the basic properties of the X-ray emission from heavy, few-electron ions without the need for invoking sophisticated MCDF calculations. PACS

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Section: Isotropy Of the Kα 1 Radiation From The Helium-like Uranium mentioning

confidence: 97%

Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: Alignment Parameters Within the Independent Particle Modelmentioning

confidence: 99%

Section: Alignment Of the Helium-and Beryllium-like Heavy Ionsmentioning

confidence: 99%

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Electron capture into few-electron heavy ions: Independent particle model

2007

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Fine-structure effects on the polarization of Kα1 radiation from heavy, highly-charged ions

Surzhykov

Stöhlker²,

Fritzsche

2009

Nuclear Instruments and Methods in Physics Research Section B:

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Polarization of the Lyman line emission following radiative recombination of bare ions: effects of relativity and radiation multipoles

Bettadj¹,

Inal²,

Benmouna³

2014

J. Phys. B: At. Mol. Opt. Phys.

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We have calculated the degree of linear polarization of the Ly-α 1 (2p 3/2 → 1s 1/2 ) and Ly-β 1 (3p 3/2 → 1s 1/2 ) lines emitted after radiative recombination of spinless bare nuclei with unidirectional, unpolarized electrons. These calculations have been performed for various recombined H-like ions with atomic numbers in the range 10 Z 92. Several incident-electron kinetic energies ε 0 ranging from 0.01 to 10 times the electron binding energy in the 1s 1/2 ground state were considered and the radiative cascades following recombination into states with principal quantum number up to n = 6 were included. Three sets of cross sections for radiative recombination to individual magnetic sublevels of the excited levels of the recombined H-like ions were computed: the first two in the electric-dipole approximation with the nonrelativistic and relativistic electron wavefunctions and the third one in the exact relativistic method including all multipole orders of the radiation field. Results for the polarization calculated using these three sets of cross-section data were compared in order to stress the relative importance of relativistic and multipole effects as Z or ε 0 increases.

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Magnetic Sublevel Population Studied for H- and He-like Uranium in Relativistic Ion–Atom Collisions

Cited by 11 publications

References 6 publications

Electron capture into few-electron heavy ions: Independent particle model

Electron capture into few-electron heavy ions: Independent particle model

Fine-structure effects on the polarization of Kα1 radiation from heavy, highly-charged ions

Polarization of the Lyman line emission following radiative recombination of bare ions: effects of relativity and radiation multipoles

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