激光烧蚀脉冲放电激发的土壤等离子体电子数密度和温度的研究  

Electron Temperature and Density of Soil Plasma Generated by Laser Ablation Fast Pulse Discharge Spectroscopy

作　　者：李霞芬[1] 周卫东[1] 钱惠国[1] 李科学[1] 

机构地区：[1]浙江师范大学信息光学研究所,浙江金华321004

出　　处：《光学学报》2011年第11期291-296,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61178034);浙江省自然科学基金(Y1100268);浙江省高校重大科技攻关项目(ZD2009006)资助课题

摘　　要：以激光烧蚀快脉冲放电激发土壤为例,研究了激光烧蚀快脉冲放电等离子体技术产生的土壤等离子体的电子数密度和温度。根据实验测得的Si原子和离子谱线的强度和萨哈玻尔兹曼方程,计算了等离子体的电子温度,并从分析Si I 250.69nm谱线的斯塔克展宽中导出了等离子体的电子数密度。与使用同样激光能量激发的激光等离子体相比,激光烧蚀快脉冲放电激发等离子体的电子数密度和温度都明显增加,与观察到的光谱信号强度是一致的。Electron number density and temperature of soil plasma generated by laser ablation-fast pulse discharge plasma spectroscopic （LA-FPDPS） technique are studied. The experimentally measured line intensities of atomic and ionic states of silicon are used for electron temperature calculation from the Saha-Boltzmann equation. The electron number density is determined by using the Stark broadening of silicon 250.69 nm line emitted by the plasma. In comparison to the laser-produced plasma using the same laser energy, there is a considerable enhancement both in electron number density and electron temperature in plasma generated by LA-FPDPS of using a fast micro second discharge spark, which is consistent with the line intensity enhancement in lA-PI3PR

关 键 词：光谱学 激光烧蚀快脉冲放电 土壤 电子温度 电子数密度 

分 类 号：O433.4[机械工程—光学工程]