类氦K ALPHA G比的高温行为：钙、铁和镍复合速率系数改进的影响
High-temperature behaviour of the helium-like K ALPHA G ratio: the effect of improved recombination rate coefficients for calcium, iron, and nickel
摘要：
结果表明，以上的温度的最大丰度，重组率到激发态的类He离子，使用较早的计算，更近似的方法显着不同的速率从最近的扭曲波和R-矩阵计算（统一的重组率系数）的Ca，Fe和Ni。目前的速率导致G比大大低于那些从更近似的速率在以前的作品，由高达6倍，在高电子温度。扭曲波和R矩阵率之间的良好协议，以及从它们计算的G比的良好协议，为这些新值的准确性提供了支持，这些新值具有广泛的适用性，可用于各种天体物理和实验室来源的X射线光谱的建模和解释。
英文摘要：
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 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.
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