等离子体中辐射的附加谱宽和谱形

The Line Width and Shape of Emission in Plasmas

等离子体为耗散介质，其中离子（或原子）辐射谱线将获得一个附加“宽度”２κ（ω），其中２κ（ω）代表等离子体中频率为ω的光子的衰率，这样就有可能对实验测得的等离子体中氢原子Ｌｙｍａｎ－α线的谱宽与传统理论的偏差提供一种解释。另外，由于２κ（ω）是ω的函数，等离子体中谱线形状将与洛仑兹谱形有差异。本文给出了不同浓度和不同温度下等离子体中ＣＩＶ离子的辐射谱形，在一定的浓度和温度区间，辐射谱形的顶端甚至可能出现一个“凹坑”。

Plasma is dissipative medium, so the line of emission in plasma will have an additional “width ” 2κ(ω), where 2κ(ω) represents the decay rate of the photon of frequency ω in plasma. It therefore affords a possibility to explain the discrepancy between the measured width of the Lyman-α line profile of hydrogen in plasma and the calculated value by conventional theory. Besides, since κ(ω) is ω dependent , the line shape will deviate from the Lorentzian profile. We show in this paper the line shapes of C IV ion in plasmas with different density and temperature. In some range of parameters, even a dip is developed on the top of the line profile.