Evidence for Strong Breit Interaction in Dielectronic Recombination of Highly Charged Heavy Ions

Nakamura, Nobuyuki; Kavanagh, Anthony; Watanabe, Hirofumi; Sakaue, Hiroyuki; Li, Yueming; Kato, Daiji; Currell, Frederick; Ohtani, S.

doi:10.1103/physrevlett.100.073203

Cited by 92 publications

(55 citation statements)

References 27 publications

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“…In all of these calculations, the contribution of the Breit interaction is taken into account, which has been proven to be very important [32,36,37,75]. As seen from the figure, the present cross-sections are a little bit smaller than other ones.…”

Section: Excitation Energies and Electron-impact Excitation Cross-secmentioning

confidence: 83%

Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions

et al. 2015

Atoms

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Electron impact excitation (EIE) and dielectronic recombination (DR) of tungsten ions are basic atomic processes in nuclear fusion plasmas of the International Thermonuclear Experimental Reactor (ITER) tokamak. Detailed investigation of such processes is essential for modeling and diagnosing future fusion experiments performed on the ITER. In the present work, we studied total and partial electron-impact excitation (EIE) and DR cross-sections of highly charged tungsten ions by using the multiconfiguration Dirac-Fock method. The degrees of linear polarization of the subsequent X-ray emissions from unequally-populated magnetic sub-levels of these ions were estimated. It is found that the degrees of linear polarization of the same transition lines, but populated respectively by the EIE and DR processes, are very different, which makes diagnosis of the formation mechanism of X-ray emissions possible. In addition, with the help of the flexible atomic code on the basis of the relativistic configuration interaction method, DR rate coefficients of highly charged W 37+ to W 46+ ions are also studied, because of the importance in the ionization equilibrium of tungsten plasmas under running conditions of the ITER.

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Section: Excitation Energies and Electron-impact Excitation Cross-secmentioning

confidence: 83%

Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions

et al. 2015

Atoms

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“…The recent studies showed that the Breit interaction may give important and even dominant contribution to the cross section of the dielectronic recombination with few-electron highly charged ions [9,[13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Lyashchenko

Andreev

2016

Phys. Rev. A

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“…It is found that the peak at the lowest energy is strongly affected by the GBI and that the calculated cross section without the GBI fails to reproduce the experimental result whereas that with the GBI reproduces the experiment well. The present result clearly shows the importance of the GBI, which is the lowest order quantum electrodynamics effect in electron-ion collisions, in DR processes of highly charged heavy ions [12]. Figure 3a shows the abundance ratio of B-like to Be-like Bismuth.…”

Section: Ion Abundance Measurementsmentioning

confidence: 72%

Structure and dynamics of highly charged heavy ions studied with the electron beam ion trap in Tokyo

Nakamura

Watanabe

et al. 2011

Hyperfine Interact

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In this paper, we present the structure and the dynamics of highly charged heavy ions studied through dielectronic recombination (DR) observations performed with the Tokyo electron beam ion trap. By measuring the energy dependence of the ion abundance ratio in the trap at equilibrium, we have observed DR processes for open shell systems very clearly. Remarkable relativistic effects due to the generalized Breit interaction have been clearly shown in DR for highly charged heavy ions. We also present the first result for the coincidence measurement of two photons emitted from a single DR event.

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Evidence for Strong Breit Interaction in Dielectronic Recombination of Highly Charged Heavy Ions

Cited by 92 publications

References 27 publications

Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions

Electron Impact Excitation and Dielectronic Recombination of Highly Charged Tungsten Ions

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Structure and dynamics of highly charged heavy ions studied with the electron beam ion trap in Tokyo

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