论文标题
N类等电子序列的R-Matrix Electron-Impact激发数据
R-matrix electron-impact excitation data for the N-like iso-electronic sequence
论文作者
论文摘要
来自N样离子的光谱线可用于测量各种天体物理等离子体的温度和密度。天体等离子体建模代码的原子数据库仍然有改进其电子障碍激发数据集的n样离子，尤其是$ r $ -Matrix数据的空间。这尤其与将来的观测值（例如Arcus）尤其重要，该观测值将托管高分辨率光谱仪。我们的目标是在从O II到Zn XXIV的N-like离子（即O $ $^{+} $ to Zn $^{23+} $）的广泛温度上获得所有高达$ NL = 5D $的有效碰撞强度，并评估当前工作的准确性。我们还通过用Chianti对太阳观测进行建模，研究了我们的新数据对等离子体诊断的影响。我们对N类离子进行了系统的$ r $ r $ -Matrix计算，其中包括725个精细结构目标水平，在配置交互目标和密切耦合碰撞扩展中。 $ R $ -MATRIX中间耦合框架转换方法用于计算碰撞强度，而自动结构代码用于原子结构。我们将选定离子的当前结果与档案数据库中的离子和文献进行了比较。该比较涵盖能量水平，振荡器强度和有效的碰撞强度。与仅使用扭曲波数据的Chianti模型相比，我们展示了改进的血浆诊断示例，以及一些使用以前的$ r $ -matrix数据的示例。根据原子数据和分析结构（ADAS）数据类IT ADF04，将对电子影响激发数据进行存档，并将在开放式ADA中使用。数据可用于改善天体物理等离子体诊断的原子数据库。
Spectral lines from N-like ions can be used to measure the temperature and density of various types of astrophysical plasmas. The atomic databases of astrophysical plasma modelling codes still have room for improvement in their electron-impact excitation data sets for N-like ions, especially $R$-matrix data. This is particularly relevant for future observatories (e.g. Arcus) which will host high-resolution spectrometers. We aim to obtain level-resolved effective collision strengths for all transitions up to $nl=5d$ over a wide range of temperatures for N-like ions from O II to Zn XXIV (i.e., O$^{+}$ to Zn$^{23+}$) and to assess the accuracy of the present work. We also examine the impact of our new data on plasma diagnostics by modelling solar observations with CHIANTI. We have carried-out systematic $R$-matrix calculations for N-like ions which included 725 fine-structure target levels in both the configuration interaction target and close-coupling collision expansions. The $R$-matrix intermediate coupling frame transformation method was used to calculate the collision strengths, while the AUTOSTRUCTURE code was used for the atomic structures. We compare the present results for selected ions with those in archival databases and the literature. The comparison covers energy levels, oscillator strengths, and effective collision strengths. We show examples of improved plasma diagnostics when compared to CHIANTI models which use only distorted wave data as well as some which use previous $R$-matrix data. The electron-impact excitation data are archived according to the Atomic Data and Analysis Structure (ADAS) data class it adf04 and will be available in OPEN-ADAS. The data can be used to improve the atomic databases for astrophysical plasma diagnostics.
