The spectra from singly ionized argon Ar II has significant diagnostic capability in the characterization and modelling of both magnetically-confined fusion and astrophysical plasmas. The literature has several pre-existing data sets for Ar but this paper presents the results from 3 new atomic structure and electron-impact scattering models in order to better constrain the differences in atomic data and how they impact well-known plasma diagnostics. Several independent atomic structure methodologies are employed to calculate the energy levels and transition probabilities for each model. The first approach employs a relativistic Dirac–Coulomb Hamiltonian model, the second approach uses a semi-relativistic Breit–Pauli Hamiltonian with the mass-velocity, Darwin and spin–orbit corrections, and in a third case an ICFT approach. Three atomic structure models provide a foundation for Dirac R-matrix, a semi-relativistic ICFT (Intermediate Coupling Frame Transformation) and a Breit–Pauli R-Matrix with Pseudostates (BPRMPS) calculation. Synthetic spectra utilizing these three data sets are compared against measurements taken at the Compact Toroidal Hybrid (CTH) stellarator, and the total radiative power loss is also benchmarked against previous calculations.

中文翻译：

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Ar II 的原子结构、电子碰撞激发和碰撞辐射建模


单电离氩 Ar II 的光谱在磁约束聚变和天体物理等离子体的表征和建模方面具有显着的诊断能力。文献中有几个预先存在的 Ar 数据集，但本文介绍了 3 个新原子结构和电子碰撞散射模型的结果，以便更好地限制原子数据的差异以及它们如何影响众所周知的等离子体诊断。采用几种独立的原子结构方法来计算每个模型的能级和跃迁概率。第一种方法采用相对论狄拉克-库仑哈密顿模型，第二种方法采用带有质量速度、达尔文和自旋轨道修正的半相对论布赖特-泡利哈密顿模型，第三种方法采用 ICFT 方法。三个原子结构模型为 Dirac R 矩阵、半相对论 ICFT（中间耦合框架变换）和带有伪态的 Breit-Pauli R 矩阵 (BPRMPS) 计算提供了基础。利用这三个数据集的合成光谱与紧凑环形混合 (CTH) 仿星器的测量结果进行了比较，总辐射功率损耗也与之前的计算进行了比较。