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利用单脉冲YAG激光、YGJ Ⅱ激光微区分析仪结合光电检测系统 ,在减压氩气环境下实验研究了金属分析样品发射光谱中CuⅠ 32 4 7nm和CuⅠ 32 7 4nm的时间特性、谱线强度及空间分布 ,并与空气环境下的实验结果进行了比较。实验结果表明在减压氩气环境下 ,激光微区发射光谱与环境气体、环境气压和辅助激发参数密切相关。当辅助电极端面直径为 1 5mm、辅助电极距分析样品表面高度为 4mm、辅助电极间距为3mm、辅助激发电压为 1 30 0V、氩气压力 33 2kPa时 ,CuⅠ 32 4 7nm和CuⅠ 32 7 4nm谱线的发射时间比空气下延长了 50 0 μs,谱线强度约为相同气压空气环境下的 4倍 ,约为 1个大气压空气环境下谱线强度的 2倍 ,谱线的半最大值宽度明显变窄。因此氩气环境延长了谱线的发射时间 ,减少了自吸效应 ,使谱线强度明显增强 ,谱线品质得到显著改善。
Using the single-pulse YAG laser and YGJ Ⅱ laser micro-area analyzer combined with the photoelectric detection system, the time characteristics of CuI 32 4 7nm and CuI 32 7 4nm in the emission spectra of the metal samples were experimentally studied in vacuum argon atmosphere. The spectral intensity And spatial distribution, and compared with the experimental results in the air environment. The experimental results show that the laser emission spectra are closely related to the ambient gas, ambient pressure and auxiliary excitation parameters under the reduced pressure of argon. When the diameter of the auxiliary electrode tip is 1 5mm, the height of the auxiliary electrode is 4mm from the surface of the analytical sample, the distance between the auxiliary electrodes is 3mm, the auxiliary excitation voltage is 1300V and the argon pressure is 33 2kPa, the CuI3247nm and CuI3274nm spectra The emission time of the line is 50 0 μs longer than that under air, and the intensity of the line is about 4 times of that under the same air pressure, about twice the intensity of the line at 1 atmosphere. The half maximum width of the line is obviously Narrow. Therefore, the argon environment prolongs the emission time of the spectral line, reduces the self-absorption effect, significantly increases the spectral line intensity and significantly improves the spectral line quality.