Spectroscopy Letters ( IF 1.1 ) Pub Date : 2021-06-01 , DOI: 10.1080/00387010.2021.1931785 Zhiqiang Zhen 1 , Jian He 1
Abstract
For accurate electron density diagnostics of plasma, the spectral diagnostics for four-level system instead of three-level system by collision excitation model are investigated. Taking the first four levels of magnesium VIII ion as an example, the relationship of electron density with line ratio is discussed, for a large region of electron density. Results show that when the electron density varies from 1011 cm−3 to 1013 cm−3, the electron density decreases with increasing of line ratio; at a same line ratio, the electron density obtained from the four-level system is smaller than that from the three-level system; at low electron density limit, the line ratio is 2, while at high electron density limit, the line ratio is 0.0467, which are both in good agreement with the theoretical predicted value. This discussion is significant in spectral diagnostics of plasma.
中文翻译:
碰撞激发模型对四能级系统电子密度的光谱诊断
摘要
为了准确诊断等离子体的电子密度,研究了碰撞激发模型对四能级系统而不是三能级系统的光谱诊断。以镁VIII离子的前四能级为例,讨论了电子密度与线比的关系,电子密度很大。结果表明,当电子密度从 10 11 cm -3 变化到 10 13 cm -3,电子密度随着线比的增加而降低;在相同线比下,四能级系统得到的电子密度小于三能级系统;在低电子密度极限下,线比为2,而在高电子密度极限下,线比为0.0467,与理论预测值吻合较好。该讨论对等离子体的光谱诊断具有重要意义。