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

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Spruck, K. and Badnell, N. R. and Krantz, C. and Novotný, O. and Becker, A. and Bernhardt, D. and Grieser, M. and Hahn, M. and Repnow, R. and Savin, D. W. and Wolf, A. and Müller, A. and Schippers, S. (2014) Recombination of W18+ ions with electrons : absolute rate coefficients from a storage-ring experiment and from theoretical calculations. Physical Review A, 90 (3). 032715. ISSN 1050-2947 (https://doi.org/10.1103/PhysRevA.90.032715)

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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.

ORCID iDs

Spruck, K., Badnell, N. R. ORCID logoORCID: https://orcid.org/0000-0001-7418-7996, Krantz, C., Novotný, O., Becker, A., Bernhardt, D., Grieser, M., Hahn, M., Repnow, R., Savin, D. W., Wolf, A., Müller, A. and Schippers, S.;
  • Item type:Article
    ID code:53863
    Dates:
    Date
    Event
    25 September 2014
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:24 Jul 2015 11:17
    Last modified:24 Nov 2024 01:09
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/53863
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