基于LIBS技术铁等离子体电子温度和电子密度的研究

Measurements of Electron Temperature and Electron Density in the Laser-induced Iron Plasma

将1 064纳米脉冲Nd:YAG激光器聚焦于铁条表面产生等离子体.利用10条铁原子谱线做出Boltzmann图并求得等离子体的电子温度是6 474 K,同时利于铁原子谱线382.78纳米的Stark展宽求得等离子体的电子密度是2.7×1017cm-3.基于实验结果证明本实验的铁等离子体满足局部热力学平衡.

A 1064 nm pulsed Nd：YAG is used for the ablation of iron bar in air at atmospheric pressure and the characteristics of the laser-induced iron plasma are studied.The iron plasma temperature（6474 K） is inferred by using the Boltzmann plot method with ten neutral iron lines,while the electron density（2.7 × 1017 cm-3） is obtained from the Stark broadening of the profile of Fe I 382.78 nm.The experimental results show that the laser-induced iron plasma is proved to be in local thermodynamic equilibrium.