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

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dc.creatorOelgoetz, J.
dc.creatorFontes, C. J.
dc.creatorZhang, H. L.
dc.creatorMontenegro, M.
dc.creatorNahar, S. N.
dc.creatorPradhan, A. K.
dc.date2007-09-05
dc.date2007-11-16
dc.date.accessioned2026-07-07T08:44:26Z
dc.date.available2026-07-07T08:44:26Z
dc.descriptionIt 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 six 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.
dc.description11 pages including LANL cover, 6 figures. Minor typos corrected to conform to the version that will appear in print in MNRAS. The definitive version is available at http://www.blackwellsynergy.com. Specifically http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-2966.2007.12410.x
dc.identifierhttps://arxiv.org/abs/0709.0740
dc.identifierhttp://arxiv.org/abs/0709.0740
dc.identifierMNRAS 382, 761--769 (2007)
dc.identifierdoi:10.1111/j.1365-2966.2007.12410.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/142657
dc.subjectAstrophysics
dc.subjectAtomic Physics
dc.titleHigh-temperature behaviour of the helium-like K ALPHA G ratio: the effect of improved recombination rate coefficients for calcium, iron, and nickel
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