Fe XXV和Ni XXVII的KLL双电子伴线的极化率系数
Recombination Rate Coefficients for KLL Di-electronic Satellite Lines of Fe XXV and Ni XXVII
摘要：
本文将全电子-离子复合的统一方法推广到双电子伴线的研究。这些谱线是由自电离态的辐射衰变形成的，是天体物理和实验室等离子体源的高灵敏度温度诊断。统一复合率的计算是基于相对论Breit-Pauli R矩阵方法和紧耦合近似。扩展的理论配方开发较早，我们提出的22个卫星线的KLL复合物的氦类Fe XXV和Ni XXVII的复合速率系数。孤立共振近似，通常用于整个等离子体建模，对待这些共振基本上是绑定功能，除了双电子捕获，和自电离，这些水平。通常假定为线剖面或截面形状。另一方面，通过考虑自电离通道和连续通道之间的耦合，统一方法给出了DES谱线的本征谱，不仅包括能量和强度，而且还包括自然的线或截面形状。提出了一种从统一共振强度导出自电离率的公式，并使其与孤立共振近似相对应。虽然强品系的比率与现有比率相比非常好，<20%，但较弱DES品系的差异更大。我们还说明了应用本研究结果的分析K ALPHA复合物中观察到的高温X-射线发射光谱的Fe XXV和Ni XXVII。有相当大的差异与以前的结果在总KLL强度的Fe XXV在温度低于日冕平衡的最大丰度的温度。（简要摘要）
英文摘要：
The unified method for total electron-ion recombination is extended to study the dielectronic satellite (DES) lines. These lines, formed from radiative decay of autoionizing states, are highly sensitive temperature diagnostics of astrophysical and laboratory plasma sources. The computation of the unified recombination rates is based on the relativistic Breit-Pauli R-matrix method and close coupling approximation. Extending the theoretical formulation developed earlier we present recombination rate coefficients for the 22 satellite lines of KLL complexes of helium-like Fe XXV and Ni XXVII. The isolated resonance approximation, commonly used throughout plasma modeling, treats these resonances essentially as bound features except for dielectronic capture into, and autoionization out of, these levels. A line profile or cross section shape is often assumed. On the other hand, by including the coupling between the autoionizing and continuum channels, the unified method gives the intrinsic spectrum of DES lines which includes not only the energies and strengths, but also the natural line or cross section shapes. A formulation is presented to derive autoionization rates from unified resonance strengths and enable correspondence with the isolated resonance approximation. While the rates compare very well with existing rates for the strong lines to <20%, the differences for weaker DES lines are larger. We also illustrate the application of the present results to the analysis of K ALPHA complexes observed in high-temperature X-ray emission spectra of Fe XXV and Ni XXVII. There are considerable differences with previous results in the total KLL intensity for Fe XXV at temperatures below the temperature of maximum abundance in coronal equilibrium. (Abbreviated Abstract)
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