Electron-ion recombination of Be-like C, N, and O

M. Fogle, N.R. Badnell, P. Glans, S.D. Loch, S. Madzunkov, S.A. Abdel-Naby, M.S. Pindzola, R. Schuch

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43 Citations (Scopus)


The absolute total recombination reaction rate coefficients for Be-like C, N, and O have been measured using the CRYRING storage ring and compared with the results from distorted-wave theory. For the theory results, it is found that shifts to NIST energy values for the core excited energies of the recombining system are not sufficient to accurately match all of the resonance positions and heights at lower energies. These theory results represent the quality of most archived theory DR data. The accurate calculation of these low energy resonances still presents a significant challenge to theory. In addition, trielectronic recombination resonances, associated with the formation of triply excited states during recombination, have been observed in the total recombination reaction rate coefficient spectra of N3+ and O4+. Finally, we construct a dielectronic recombination Maxwellian rate coefficient from the experimental results for low n resonances, and from the theoretical results for high n resonances. In the case of O4+, the trielectronic recombination resonances have a strong influence on the low temperature Maxwellian rate coefficient. Our best hybrid Maxwellian rate coefficient is compared with archived distorted-wave theory data, and is found to be in reasonable agreement, even at the low temperatures.

Original languageEnglish
Pages (from-to)757-766
Number of pages10
JournalExperimental Astronomy
Issue number2
Publication statusPublished - Nov 2005


  • atomic
  • molecular and nuclear data
  • finite density plasmas
  • dielectronic recombination
  • isoelectronic sequence
  • radiative recombination
  • low temperatures
  • coefficients
  • carbon
  • argon


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