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

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

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...442..757f&link_type=abstract

Astronomy and Astrophysics, Volume 442, Issue 2, November I 2005, pp.757-766

Astronomy and Astrophysics

Astrophysics

20

Atomic, Molecular And Nuclear Data

Scientific paper

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 element[3+]{N} and element[4+]{O}. 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 element[4+]{O}, 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.

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