激光诱导AlO自由基B^2Σ^+—X^2Σ^+跃迁光谱研究  

Study on the emission spectrum of AlO radical B^2Σ^+–X^2Σ^+ transition using laser-induced breakdown spectroscopy

作　　者：郭连波[1] 郝荣飞 郝中骐[1] 李阔湖[1] 沈萌[1] 任昭 李祥友[1] 曾晓雁[1] 

机构地区：[1]华中科技大学,武汉光电国家实验室(筹),武汉430074 [2]武汉新瑞达激光工程有限责任公司,武汉430074

出　　处：《物理学报》2013年第22期239-243,共5页Acta Physica Sinica

基　　金：国家重大科学仪器设备开发专项基金(批准号:2011YQ160017);国家自然科学基金(批准号:51128501)资助的课题~~

摘　　要：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 laser-induced breakdown spectroscopy, a short pulse laser is used to excite Al2O3 （content of 99%） ceramic to produce ceramic plasma. The plasma emission spectrum is collected, and 33 spectral lines of AlO radical B^2Σ＋-X^2Σ＋transition are obtained. The time-resolved AlO radical spectrum and its relationship with laser pulse energy are investigated. The results show that the emission spectrum of AlO radical appears later and lasts longer than those of Al atom and Al ion. With the increase of the laser pulse energy, the spectral intensity of AlO radical decreases and the time when the maximum spectral intensity appears moves backward. Finally, the ceramic plasma produced in air is compared with that produced in Ar environment. The results prove that the formation of AlO radical spectrum has an important relationship with O2 in air.

关 键 词：激光诱导击穿光谱 AlO自由基 B^2Σ+-X^2Σ+跃迁光谱 

分 类 号：TN24[电子电信—物理电子学]