Recombination of W19+ ions with electrons: absolute rate coefficients from a storage-ring experiment and from theoretical calculations

N. R. Badnell, K. Spruck, 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

Abstract

Experimentally measured and theoretically calculated rate coefficients for the recombination of W19+ ([Kr] 4d10 4f9) ions with free electrons (forming W18+) are presented. At low electron-ion collision energies, the merged-beams rate coefficient is dominated by strong, mutually overlapping, recombination resonances as already found previously for the neighboring charge-state ions W18+ and W20+. In the temperature range where W19+ is expected to form in a collisionally ionized plasma, the experimentally derived recombination rate coefficient deviates by up to a factor of about 20 from the theoretical rate coefficient obtained from the ADAS database. The present calculations, which employ a Breit-Wigner redistributive partitioning of autoionizing widths for dielectronic recombination via multi-electron resonances, reproduce the experimental findings over the entire temperature range.
LanguageEnglish
Number of pages6
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Publication statusAccepted/In press - 15 Apr 2016

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coefficients
ions
electrons
free electrons
collisions
temperature
energy

Keywords

  • tungsten
  • tungsten ions
  • non-equilibrium plasma

Cite this

Badnell, N. R. ; Spruck, K. ; 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 W19+ ions with electrons : absolute rate coefficients from a storage-ring experiment and from theoretical calculations. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2016.
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abstract = "Experimentally measured and theoretically calculated rate coefficients for the recombination of W19+ ([Kr] 4d10 4f9) ions with free electrons (forming W18+) are presented. At low electron-ion collision energies, the merged-beams rate coefficient is dominated by strong, mutually overlapping, recombination resonances as already found previously for the neighboring charge-state ions W18+ and W20+. In the temperature range where W19+ is expected to form in a collisionally ionized plasma, the experimentally derived recombination rate coefficient deviates by up to a factor of about 20 from the theoretical rate coefficient obtained from the ADAS database. The present calculations, which employ a Breit-Wigner redistributive partitioning of autoionizing widths for dielectronic recombination via multi-electron resonances, reproduce the experimental findings over the entire temperature range.",
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Badnell, NR, Spruck, K, Krantz, C, Novotný, O, Becker, A, Bernhardt, D, Grieser, M, Hahn, M, Repnow, R, Savin, DW, Wolf, A, Müller, A & Schippers, S 2016, 'Recombination of W19+ ions with electrons: absolute rate coefficients from a storage-ring experiment and from theoretical calculations' Physical Review A - Atomic, Molecular, and Optical Physics.

Recombination of W19+ ions with electrons : absolute rate coefficients from a storage-ring experiment and from theoretical calculations. / Badnell, N. R.; Spruck, K.; 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 - Atomic, Molecular, and Optical Physics, 15.04.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Recombination of W19+ ions with electrons

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

AU - Badnell, N. R.

AU - Spruck, K.

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 - 2016/4/15

Y1 - 2016/4/15

N2 - Experimentally measured and theoretically calculated rate coefficients for the recombination of W19+ ([Kr] 4d10 4f9) ions with free electrons (forming W18+) are presented. At low electron-ion collision energies, the merged-beams rate coefficient is dominated by strong, mutually overlapping, recombination resonances as already found previously for the neighboring charge-state ions W18+ and W20+. In the temperature range where W19+ is expected to form in a collisionally ionized plasma, the experimentally derived recombination rate coefficient deviates by up to a factor of about 20 from the theoretical rate coefficient obtained from the ADAS database. The present calculations, which employ a Breit-Wigner redistributive partitioning of autoionizing widths for dielectronic recombination via multi-electron resonances, reproduce the experimental findings over the entire temperature range.

AB - Experimentally measured and theoretically calculated rate coefficients for the recombination of W19+ ([Kr] 4d10 4f9) ions with free electrons (forming W18+) are presented. At low electron-ion collision energies, the merged-beams rate coefficient is dominated by strong, mutually overlapping, recombination resonances as already found previously for the neighboring charge-state ions W18+ and W20+. In the temperature range where W19+ is expected to form in a collisionally ionized plasma, the experimentally derived recombination rate coefficient deviates by up to a factor of about 20 from the theoretical rate coefficient obtained from the ADAS database. The present calculations, which employ a Breit-Wigner redistributive partitioning of autoionizing widths for dielectronic recombination via multi-electron resonances, reproduce the experimental findings over the entire temperature range.

KW - tungsten

KW - tungsten ions

KW - non-equilibrium plasma

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