High-resolution x-ray spectra were recorded at the National Institute of Standards and Technology electron beam ion trap (EBIT) using two Johann-type crystal spectrometers, with their dispersion planes oriented parallel and perpendicular to the beam direction. The linear polarizations of the 1 s 2 − 1 s 2 l transitions in He-like argon ions were determined from the measured spectra at electron beam energies of 3.87 and 7.91 keV. The theoretical analysis was performed using detailed collisional-radiative modeling of the non-Maxwellian EBIT plasma with the NOMAD code modified to account for magnetic sublevel atomic kinetics. Effects influencing the polarizations of the observed 1 s 2 − 1 s 2 l lines were investigated, including radiative cascades, the 1 s 2 1 S 0 − 1 s 2 s 1 S 0 two-photon transition, and the charge exchange recombination of H-like argon ions...

中文翻译：

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He形Ar 16+中n = 2络合物的各向异性激发x射线线的线性极化

美国国家标准技术研究院使用两台Johann型晶体光谱仪记录了高分辨率的X射线光谱，其色散面平行于束线方向并垂直于束线方向。根据在电子束能量为3.87和7.91 keV时测得的光谱，可以确定He状氩离子中1 s 2-1 s 2 l跃迁的线性极化。使用非马克斯韦尔EBIT等离子体的详细碰撞辐射模型进行了理论分析，并修改了NOMAD代码以解决磁性次原子原子动力学问题。研究了影响观察到的1 s 2-1 s 2 l线的极化的影响，包括辐射级联，1 s 2 1 S 0-1 s 2 s 1 S 0双光子跃迁，