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High-temperature behaviour of the helium-like Kα G ratio: the effect of improved recombination rate coefficients for calcium, iron and nickel

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/44625

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Title: High-temperature behaviour of the helium-like Kα G ratio: the effect of improved recombination rate coefficients for calcium, iron and nickel
Creators: Nahar, Sultana Nurun; Oelgoetz, J.; Fontes, C. J.; Zhang, H. L.; Montenegro, M.; Pradhan, A. K.
Keywords: atomic data
atomic processes
line -- formation
X-rays -- general
Issue Date: 2007
Citation: Oelgoetz, J., Fontes, C. J., Zhang, H. L., Montenegro, M., Nahar, Sultana Nurun, Pradhan, A. K. "High-temperature behaviour of the helium-like Kα G ratio: the effect of improved recombination rate coefficients for calcium, iron and nickel," Monthly Notices of the Royal Astronomical Society, v. 382, no. 2, 2007, pp. 761-769.
DOI: 10.1111/j.1365-2966.2007.12410.x
Abstract: It is shown that above the temperature of maximum abundance, recombination rates into the excited states of He-like ions that are calculated using earlier, more approximate methods differ markedly from rates obtained from recent distorted-wave and R-matrix calculations (unified recombination rate coefficients) for Ca, Fe and Ni. The present rates lead to G ratios that are greatly lower than those resulting from the more approximate rates in previous works, by up to a factor of 6 at high electron temperatures. Excellent agreement between the distorted-wave and the R-matrix rates, as well as excellent agreement in the G ratios calculated from them, provides support for the accuracy of these new values which have a broad applicability to the modelling and interpreting of X-ray spectra from a variety of astrophysical and laboratory sources.
Description: Relevant data is available at: http://www.astronomy.ohio-state.edu/~nahar/nahar_radiativeatomicdata/index.html
The definitive version is available at www.blackwell-synergy.com. http://www3.interscience.wiley.com/journal/117975880/abstract
ISSN: 1365-2966
URI: http://hdl.handle.net/1811/44625
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