论文标题
离子气体中氢原子的倒水平种群
Inverted level populations of hydrogen atoms in ionized gas
论文作者
论文摘要
语境。电离气体中氢原子的水平倒置可能导致氢重组线的刺激排放，而水平的种群又可能受到强大的刺激排放的影响。目标。在这项工作中，研究了辐射场的相互作用和氢原子的水平种群反转。还研究了刺激排放对线轮廓的影响。方法。我们以前的NL模型用于计算氢原子和氢重组线的水平种群。在改进的模型中考虑了线和连续辐射场对水平种群的影响。通过使用此方法，在分析中使用了模拟氢重组线和水平种群的特性。结果。模拟表明，氢无线电重组线通常是从倒数种群中从能级发出的。强烈的刺激排放量甚至小于10 km s $^{ - 1} $，可以大大缩小HN $α$线的宽度。与总的光学深度相比，氢重组线的扩增更受光学深度的影响。评估了刺激发射对电子温度和电离气体密度估计的影响。我们发现，比较多线对核比率是估计电子温度的可靠方法，而电子密度估计的有效性取决于刺激发射的相对重要性。
Context. Level population inversion of hydrogen atoms in ionized gas may lead to stimulated emission of hydrogen recombination lines, and the level populations can in turn be affected by powerful stimulated emissions. Aims. In this work the interaction of the radiation fields and the level population inversion of hydrogen atoms is studied. The effect of the stimulated emissions on the line profiles is also investigated. Methods. Our previous nl-model for calculating level populations of hydrogen atoms and hydrogen recombination lines is improved. The effects of line and continuum radiation fields on the level populations are considered in the improved model. By using this method the properties of simulated hydrogen recombination lines and level populations are used in analyses. Results. The simulations show that hydrogen radio recombination lines are often emitted from the energy level with an inverted population. The widths of Hn$α$ lines can be significantly narrowed by strong stimulated emissions to be even less than 10 km s$^{-1}$. The amplification of hydrogen recombination lines is more affected by the line optical depth than by the total optical depth. The influence of stimulated emission on the estimates of electron temperature and density of ionized gas is evaluated. We find that comparing multiple line-to-continuum ratios is a reliable method for estimating the electron temperature, while the effectiveness of the estimation of electron density is determined by the relative significance of stimulated emission.
