Soft x-ray emission at 2.3–4.4 nm waveband in nitrogen plasma can be observed mostly from 2p-1s and 3p-1s resonant transitions. Ions of nitrogen in plasma emitting in necessary band have a high energy excited state in comparison with plasma temperature in experiments. Discharge and laser produced plasmas used in radiation sources often have non-equilibrium electron distributions with fast electrons. In this study the radiative properties of non-equilibrium nitrogen plasma with fast electrons are examined and the plasma conditions for optimal soft x-ray emission output in the water-window region are explored. Kinetic parameters for non-equilibrium plasma including major inelastic ion interaction processes, radiation characteristics are obtained in approach based on the Hartree-Fock-Slater quantum-statistical model and the distorted wave approximation. The presence of fast electrons in plasma at relatively small portions may have a significant influence on the ion level population...

中文翻译：

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快速电子对软X射线光谱范围内非平衡氮等离子体发射特性的影响

在2p-1s和3p-1s共振跃迁中，可以观察到氮等离子体在2.3-4.4 nm波段的软X射线发射。与实验中的等离子体温度相比，在必要的能带中发射的等离子体中的氮离子具有高能激发态。辐射源中使用的放电和激光产生的等离子体通常具有快速电子具有不平衡的电子分布。在这项研究中，研究了具有快速电子的非平衡氮等离子体的辐射特性，并探索了在水窗区域中最佳软X射线发射输出的等离子体条件。非平衡等离子体的动力学参数，包括主要的非弹性离子相互作用过程，利用Hartree-Fock-Slater量子统计模型和畸变波逼近方法获得辐射特性。等离子体中相对较小部分的快速电子的存在可能会对离子能级总体产生重大影响...