Angular distribution of characteristic photons after radiative electron capture at strong central fields

Drukarev, E. G.; Ma, Xueli; Михайлов, А. И.; Михайлов, И. В.; Mokler, P. H.

doi:10.1103/physreva.74.022717

Cited by 9 publications

(7 citation statements)

References 23 publications

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“…Two-step calculations have first been performed by Scofield [23] for the REC into bare and hydrogen-like titanium and iron ions and have been extended later successfully towards the high-Z domain [27][28][29][30][31]. However, while the capture into (initially) bare ions can be treated today quite rigorously by applying exact relativistic bound and continuum (electronic) wavefunctions, some approximate methods are required to evaluate the two-electron states.…”

Section: +mentioning

confidence: 99%

“…However, while the capture into (initially) bare ions can be treated today quite rigorously by applying exact relativistic bound and continuum (electronic) wavefunctions, some approximate methods are required to evaluate the two-electron states. Apart from the multiconfiguration Dirac-Fock (MCDF) method, which provides a systematic approach to the electronelectron interaction effects [29,30], the REC into (initially) hydrogen-like uranium ions U 90+ can still be understood within the independent particle model [31]. This model, which takes the Pauli principle into account, should be well justified for the REC of heavy ions since the interelectronic effects are much weaker in the high-Z domain than the electron-nucleus interaction.…”

Section: +mentioning

confidence: 99%

“…Namely, while the Lyman-α 1 radiation exhibited a strong angular dependence, the Kα 1 decay gave rise to an almost isotropic emission pattern. Recently, it has been found that such an isotropy results from the mutual cancellation of the angular distributions of the -strongly anisotropic -J f = 1 → J 0 = 0 electric dipole and J f = 2 → J 0 = 0 magnetic quadrupole transitions, both of which contribute to the Kα 1 radiation [30,31]. Mathematically, this cancellation implies a vanishing effective anisotropy parameter β eff 2 which governs the shape of the Kα 1 angular distribution…”

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

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: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

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

confidence: 99%

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

2007

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“…͓3,[17][18][19] In the first step, therefore, an excited level of the projectiles can be formed either by electron capture, collisional excitation or inner-shell ionization processes. Since in ion-atom collisions at storage rings the ion momentum determines the only preferred direction of the overall system, the resulting ion may appear to be aligned along this direction.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Kα1radiation from heavy, heliumlike ions produced in relativistic collisions

Surzhykov

Stöhlker²,

Fritzsche

2006

Phys. Rev. A

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Bound-state transitions in few-electron, heavy ions following radiative electron capture are studied within the framework of the density matrix theory and the multiconfiguration Dirac-Fock approach. Special attention is paid to the K␣ 1 ͑1s 1/2 2p 3/2 1,3 P J=1,2 → 1s 1/2 2 1 S J=0 ͒ radiative decay of heliumlike uranium U 90+ projectiles.This decay has recently been observed at the GSI facility in Darmstadt, giving rise to a surprisingly isotropic angular distribution, which is inconsistent with previous experiments and calculations based on a "oneparticle" model. We show that the unexpected isotropy essentially results from the mutual cancellation of the angular distributions of the 1 P 1 → 1 S 0 electric dipole and 3 P 2 → 1 S 0 magnetic quadrupole transitions, both of which contribute to the K␣ 1 radiation. Detailed computations on the anisotropy of the K␣ 1 radiation have been carried out for a wide range of projectile energies and are compared to available experimental data.

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“…1 S 0 electric dipole (E1) and 3 P 2 ? 1 S 0 magnetic quadrupole (M2) transitions, both of which contribute to the Ka 1 radiation [10][11][12].…”

Section: Introductionmentioning

confidence: 99%