We investigated experimentally and theoretically dielectronic recombination (DR) populating doubly excited configurations (LMM) in Fe xvii, the strongest channel for soft X-ray line formation in this ubiquitous species. We used two different electron beam ion traps and two complementary measurement schemes for preparing the Fe xvii samples and evaluating their purity, observing negligible contamination effects. This allowed us to diagnose the electron density in both EBITs. We compared our experimental resonant energies and strengths with those of previous independent work at a storage ring as well as those of configuration interaction, multiconfiguration Dirac–Fock calculations, and many-body perturbation theory. This last approach showed outstanding predictive power in the comparison with the combined independent experimental results. From these we also inferred DR rate coefficients, unveiling discrepancies from those compiled in the OPEN-ADAS and AtomDB databases.

我们从实验和理论上研究了双电子复合 (DR)在 Fe xvii 中填充双激发配置(LMM) ，这是这种无处不在的物种中软 X 射线线形成的最强通道。我们使用两种不同的电子束离子阱和两种互补的测量方案来制备 Fe xvii样品并评估其纯度，观察到可忽略的污染影响。这使我们能够诊断两个 EBIT 中的电子密度。我们将我们的实验共振能量和强度与之前在存储环上的独立工作以及配置相互作用、多配置 Dirac-Fock 计算和多体微扰理论的共振能量和强度进行了比较。与组合的独立实验结果相比，最后一种方法显示出出色的预测能力。从这些我们还推断出 DR 率系数，揭示了与 OPEN-ADAS 和 AtomDB 数据库中编译的那些的差异。