Recombination of W18+ ions with electrons: absolute rate coefficients from a storage-ring experiment and from theoretical calculations

K. Spruck, N. R. Badnell, C. Krantz, O. Novotný, A. Becker, D. Bernhardt, M. Grieser, M. Hahn, R. Repnow, D. W. Savin, A. Wolf, A. Müller, S. Schippers

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We present experimentally measured and theoretically calculated rate coefficients for the electron-ion recombination of W18+([Kr]4d104f10) forming W17+. At low electron-ion collision energies, the merged-beam rate coefficient is dominated by strong, mutually overlapping recombination resonances. In the temperature range where the fractional abundance of W18+ is expected to peak in a fusion plasma, the experimentally derived Maxwellian recombination rate coefficient is 5 to 10 times larger than that which is currently recommended for plasma modeling. The complexity of the atomic structure of the open-4f system under study makes the theoretical calculations extremely demanding. Nevertheless, the results of the present Breit-Wigner partitioned dielectronic recombination calculations agree reasonably well with the experimental findings. This also gives confidence in the ability of the theory to generate sufficiently accurate atomic data for the plasma modeling of other complex ions.

LanguageEnglish
Article number032715
Number of pages10
JournalPhysical Review A
Volume90
Issue number3
DOIs
Publication statusPublished - 25 Sep 2014

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coefficients
electron-ion recombination
ions
electrons
atomic structure
confidence
fusion
collisions
temperature
energy

Keywords

  • rate coefficients
  • W18+ ions
  • theoretical calculations
  • Maxwellian recombination rate

Cite this

Spruck, K. ; Badnell, N. R. ; Krantz, C. ; Novotný, O. ; Becker, A. ; Bernhardt, D. ; Grieser, M. ; Hahn, M. ; Repnow, R. ; Savin, D. W. ; Wolf, A. ; Müller, A. ; Schippers, S. / Recombination of W18+ ions with electrons : absolute rate coefficients from a storage-ring experiment and from theoretical calculations. In: Physical Review A. 2014 ; Vol. 90, No. 3.
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abstract = "We present experimentally measured and theoretically calculated rate coefficients for the electron-ion recombination of W18+([Kr]4d104f10) forming W17+. At low electron-ion collision energies, the merged-beam rate coefficient is dominated by strong, mutually overlapping recombination resonances. In the temperature range where the fractional abundance of W18+ is expected to peak in a fusion plasma, the experimentally derived Maxwellian recombination rate coefficient is 5 to 10 times larger than that which is currently recommended for plasma modeling. The complexity of the atomic structure of the open-4f system under study makes the theoretical calculations extremely demanding. Nevertheless, the results of the present Breit-Wigner partitioned dielectronic recombination calculations agree reasonably well with the experimental findings. This also gives confidence in the ability of the theory to generate sufficiently accurate atomic data for the plasma modeling of other complex ions.",
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Spruck, K, Badnell, NR, Krantz, C, Novotný, O, Becker, A, Bernhardt, D, Grieser, M, Hahn, M, Repnow, R, Savin, DW, Wolf, A, Müller, A & Schippers, S 2014, 'Recombination of W18+ ions with electrons: absolute rate coefficients from a storage-ring experiment and from theoretical calculations' Physical Review A, vol. 90, no. 3, 032715. https://doi.org/10.1103/PhysRevA.90.032715

Recombination of W18+ ions with electrons : absolute rate coefficients from a storage-ring experiment and from theoretical calculations. / Spruck, K.; Badnell, N. R.; Krantz, C.; Novotný, O.; Becker, A.; Bernhardt, D.; Grieser, M.; Hahn, M.; Repnow, R.; Savin, D. W.; Wolf, A.; Müller, A.; Schippers, S.

In: Physical Review A, Vol. 90, No. 3, 032715, 25.09.2014.

Research output: Contribution to journalArticle

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T1 - Recombination of W18+ ions with electrons

T2 - Physical Review A - Atomic, Molecular, and Optical Physics

AU - Spruck, K.

AU - Badnell, N. R.

AU - Krantz, C.

AU - Novotný, O.

AU - Becker, A.

AU - Bernhardt, D.

AU - Grieser, M.

AU - Hahn, M.

AU - Repnow, R.

AU - Savin, D. W.

AU - Wolf, A.

AU - Müller, A.

AU - Schippers, S.

PY - 2014/9/25

Y1 - 2014/9/25

N2 - We present experimentally measured and theoretically calculated rate coefficients for the electron-ion recombination of W18+([Kr]4d104f10) forming W17+. At low electron-ion collision energies, the merged-beam rate coefficient is dominated by strong, mutually overlapping recombination resonances. In the temperature range where the fractional abundance of W18+ is expected to peak in a fusion plasma, the experimentally derived Maxwellian recombination rate coefficient is 5 to 10 times larger than that which is currently recommended for plasma modeling. The complexity of the atomic structure of the open-4f system under study makes the theoretical calculations extremely demanding. Nevertheless, the results of the present Breit-Wigner partitioned dielectronic recombination calculations agree reasonably well with the experimental findings. This also gives confidence in the ability of the theory to generate sufficiently accurate atomic data for the plasma modeling of other complex ions.

AB - We present experimentally measured and theoretically calculated rate coefficients for the electron-ion recombination of W18+([Kr]4d104f10) forming W17+. At low electron-ion collision energies, the merged-beam rate coefficient is dominated by strong, mutually overlapping recombination resonances. In the temperature range where the fractional abundance of W18+ is expected to peak in a fusion plasma, the experimentally derived Maxwellian recombination rate coefficient is 5 to 10 times larger than that which is currently recommended for plasma modeling. The complexity of the atomic structure of the open-4f system under study makes the theoretical calculations extremely demanding. Nevertheless, the results of the present Breit-Wigner partitioned dielectronic recombination calculations agree reasonably well with the experimental findings. This also gives confidence in the ability of the theory to generate sufficiently accurate atomic data for the plasma modeling of other complex ions.

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