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首页> 外文会议>Conference on Superintense Light Fields and Ultrafast Processes; 20030630-20030704; St.Petersburg; RU >Excitation mechanism of hydrogen emission in the laser induced atmospheric plasma in water sample
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Excitation mechanism of hydrogen emission in the laser induced atmospheric plasma in water sample

机译：水样中激光诱导大气等离子体中氢释放的激发机理

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摘要

An experimental study has been carried out on the dynamical process taking place in the plasma generated by a Q-switched Nd-YAG laser (1,064 nm, 8 ns, 175 mJ) on a water surface at atmospheric air pressure. Accurate dynamical characterization of the resulting plasma has been carried out using gated intensified optical multichannel analyzer. The occurrence of the hydrogen emission lines of H I 656.2 nm (H_α), H I 486.1 nm (H_β), H I 434.0 nm (H_γ) and H I 410.1 nm (H_δ) was observed. Line broadening of hydrogen emission lines was studied in term of its emission time profile. In addition to reaffirming the role of the shock wave mechanism in the generation of atmospheric plasma, an analysis of the time-resolved spatial integrated of emission intensities and the time-resolved averaged temperature was made using the emission lines of Cu I 510.5 nm and Cu I 521.8 nm. As a result, the occurrence of two-stage emission processes, the shock excitation stage and cooling stage has been proved. The experimental result considering the characteristics of the atmospheric plasma can be well understood by considering the shock wave model instead of breakdown mechanism. Further application for quantitative analysis of calcium and sodium in water was also performed. A linear calibration curve was obtained without using any internal standardization and the detection limit in this stage of the experiment was estimated to be less than 1 ppm for calcium and sodium in water.
机译：已对在大气压力下水表面上由Q开关Nd-YAG激光（1,064 nm，8 ns，175 mJ）产生的等离子体中发生的动力学过程进行了实验研究。使用门控增强型光学多通道分析仪已经对所得等离子体进行了精确的动态表征。观察到出现了H I 656.2 nm（H_α），H I 486.1 nm（H_β），H I 434.0 nm（H_γ）和H I 410.1 nm（H_δ）的氢发射谱线。根据氢气的发射时间分布图研究了氢气发射管线的管线加宽。除了重申冲击波机制在大气等离子体产生中的作用外，还使用Cu I 510.5 nm和Cu的发射谱线分析了发射强度的时间分辨空间积分和时间分辨平均温度。 I 521.8 nm。结果，证明了两阶段排放过程的发生，激振阶段和冷却阶段。考虑冲击波模型而不是击穿机理，可以很好地理解考虑大气等离子体特性的实验结果。还进行了定量分析水中钙和钠的进一步应用。在不使用任何内部标准化的情况下获得了线性校准曲线，并且在该实验阶段的检测限据估计水中的钙和钠含量小于1 ppm。

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