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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >A comprehensive set of UV and x-ray radiative transition rates for Fe XVI
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A comprehensive set of UV and x-ray radiative transition rates for Fe XVI

机译：Fe XVI的一整套紫外线和X射线辐射跃迁速率

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摘要

Sodium-like Fe XVI is observed in collisionally ionized plasmas such as stellar coronae and coronal line regions of active galactic nuclei including black hole-accretion disc environments. Given its recombination edge from neon-like Fe XVII at similar to 25 angstrom, the Fe XVI bound-bound transitions lie in the soft x-ray and EUV (extreme ultraviolet) range. We present a comprehensive set of theoretical transition rates for radiative dipole allowed E1 transitions including fine structure for levels with nl(SL J) <= 10, l <= 9 using the relativistic Breit-Pauli R-matrix (BPRM) method. In addition, forbidden transitions of electric quadrupole (E2), electric octupole (E3), magnetic dipole (M1) and magnetic quadrupole (M2) type are presented for levels up to 5g(SLJ) from relativistic atomic structure calculations in the Breit-Pauli approximation using code SUPERSTRUCTURE. Some of the computed levels are autoionizing, and oscillator strengths among those are also provided. BPRM results have been benchmarked with the relativistic coupled cluster method and the atomic structure Dirac-Fock code GRASP. Levels computed with the electron collision BPRM codes in bound state mode were identified with a procedure based on the analysis of quantum defects and asymptotic wavefunctions. The total number of Fe XVI levels considered is 96, with 822 E1 transitions. Tabulated values are presented for the oscillator strengths f, line strengths S and Einstein radiative decay rates A. This extensive dataset should enable spectral modelings up to highly excited levels, including recombination-cascade matrices.
机译：在碰撞离子化的等离子体（例如恒星冠和活动银河核的冠状线区域，包括黑洞积聚的盘状环境）中观察到类似钠的Fe XVI。鉴于其从类似于氖的Fe XVII的复合边缘（约25埃），Fe XVI的键合跃迁位于柔和的X射线和EUV（极紫外）范围内。我们使用相对论Breit-Pauli R矩阵（BPRM）方法，为辐射偶极允许的E1跃迁提供了一套完整的理论跃迁速率，包括nl（SL J）<= 10，l <= 9的能级的精细结构。此外，根据Breit-Pauli的相对论原子结构计算，提出了电四极杆（E2），电八极杆（E3），磁偶极（M1）和磁四极杆（M2）类型的禁化跃迁，其水平最高为5g（SLJ）。使用代码SUPERSTRUCTURE进行近似。一些计算出的能级正在自动电离，并且还提供了其中的振荡器强度。 BPRM结果已经用相对论耦合簇方法和原子结构Dirac-Fock代码GRASP进行了基准测试。通过基于量子缺陷和渐近波函数分析的程序，确定了在束缚态模式下由电子碰撞BPRM码计算出的能级。 Fe XVI含量的总数为96，具有822个E1跃迁。列出了振荡器强度f，线强度S和爱因斯坦辐射衰减率A的列表值。这一广泛的数据集应能实现高达高激发能级的光谱建模，包括重组级联矩阵。

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