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基于激光诱导击穿光谱技术,利用Nd:YAG脉冲激光激发Al2O3(含量为99%)陶瓷片产生等离子体,获得了AlO自由基B2Σ+—X2Σ+跃迁的33条发射谱线.就AlO自由基光谱的时间演化规律和激光能量对谱线的影响规律进行了研究与分析.结果表明,AlO自由基光谱出现在Al原子和Al离子光谱之后,且持续时间较长.当激光的脉冲能量由10 mJ起不断增加时,AlO自由基光谱强度逐渐减小,且最大值出现时间随激光能量的增加而后移.在此基础上,进行了陶瓷等离子体在空气和氩气环境下的对比试验,发现从Al2O3陶瓷片中激发所产生的AlO自由基必须有空气中O2参与反应.
Based on the laser-induced breakdown spectroscopy, 33 emission lines of the B2Σ + -X2Σ + transition of AlO radical were obtained by plasma generation of Nd: YAG pulsed laser excited Al2O3 ceramics with a content of 99% The time evolution of the spectrum and the influence of the laser energy on the line were studied and analyzed.The results show that the AlO radical spectrum appears after the Al atom and the Al ion spectrum and lasts longer.When the pulse energy of the laser changes from 10 The spectral intensity of AlO radical decreases gradually as mJ increases, and the maximum appears later with the increase of laser energy.On the basis of this, the comparative experiment of ceramic plasma in air and argon environment was carried out and found that AlO 2 ceramic particles excited by the generated AlO free radicals must be in the air O2 involved in the reaction.