Electron-ion recombination of Be-like C, N, and O
2005 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 442, no 2, 757-766 p.Article in journal (Refereed) Published
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 and . 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 , 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.
Place, publisher, year, edition, pages
2005. Vol. 442, no 2, 757-766 p.
atomic -- molecular and nuclear data
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-25861DOI: 10.1051/0004-6361:20040559OAI: oai:DiVA.org:su-25861DiVA: diva2:200701
Part of urn:nbn:se:su:diva-952004-04-052004-04-052010-08-09Bibliographically approved