摘要
采用高能量钕玻璃激光器 (～ 2 5J)激发诱导金属等离子体 ,研究了环境气体及其压力对等离子体辐射特性的影响。实验结果表明 ,相同压强下 ,氩气中等离子体的谱线强度明显高于空气中等离子体的谱线强度 ;0 .8× 10. 5Pa氩气条件下 ,光谱标钢等离子体的谱线强度达到了最大值 ;随着环境气压的增大 ,谱线自吸明显增强 ,当环境气压达到 (0 . 8～ 0 . 93)× 10 5Pa时 ,标样铝的AlⅠ 30 8 2 2nm和AlⅠ 30 9 2 7nm两条谱线产生了严重自蚀 ;另外 ,等离子体的激发温度也随环境气压的增大而增大 ,0 . 93× 10 .5Pa氩气条件下标钢等离子体的激发温度相对于 0 .4 3× 10. 5Pa时升高了近 15 0 0K。
In this experiment, the effects of gas composition and pressure on the intensity and quality of the plasma induced by a high-energy neodymium glass laser were studied. The experimental results show that the spectral intensity of the plasma in the argon atmosphere is stronger than that in the air when the pressure is the same. For the steel alloy sample, the intensities of the emission spectrum reach the maximum values when the argon pressure is 0.8 X 10(5) Pa. The self-absorption phenomena of Al II 308.22 and Al II 309.27 rim lines strengthen with the increase of the pressure, and even serious self-reversal appears when the pressure is (0.8-0.9) X 10(5) Pa. The temperature of plasma also raises with the increase of the pressure. When the argon pressure is 0.93 X 10(5) Pa, the temperature is about 1500 K higher than that when the argon pressure is about 0.43 X 10(5) Pa.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期341-345,共5页
Spectroscopy and Spectral Analysis
