摘要
为了减小谱线自发辐射跃迁几率等参量的不确定性带来的计算误差,采用一种改进型的迭代Boltzmann算法研究了激光诱导水垢等离子体的电子温度,经过12次迭代,线性相关系数由0.7687提高到0.99991,得到水垢等离子体的电子温度为5012K。Lorentz函数拟合CaⅡ393.37nm得到水垢等离子体的电子密度是5.7×1016cm-3,远高于临界值6.4×1015cm-3,证明激光诱导水垢等离子体满足局部热力学平衡模型。结果表明,本方法不仅操作简单,而且可以明显提高等离子体特征参量的求解精度。
To reduce the calculation error induced by the uncertainty of the parameters, such as spectrum spontaneous emission transition probabilities, the electron temperature of the laser-induced water scale plasma was studied using a modified iterative Boltzmann algorithm. After 12 iterations, the linear correlation coefficient was increased from 0. 7687 up to 0. 99991 while the electron temperature of the water scale plasma was 5012K. After the fitting of Ca II 393.37nm by Lorentz function, the electron density of water scale plasma was 5.7 ×10^16cm^-3, much higher than the critical value of 6.4 ×10^15cm^-3. The laser-induced water scale plasma was proved to meet the local thermodynamic equilibrium model. The experimental results show that this method not only is simple, but also can improve the solution accuracy of the characteristic parameters of the plasma significantly.
出处
《激光技术》
CAS
CSCD
北大核心
2014年第5期709-712,共4页
Laser Technology
基金
陕西省教育厅科学研究计划资助项目(2013JK0607)
西安市科技创新计划资助项目(CX12189WL02)
西安邮电大学青年教师科研基金面上项目资助项目(ZL2013-14)
关键词
激光技术
电子温度
电子密度
激光诱导击穿光谱
等离子体
发射光谱
laser technique
electron temperature
electron density
laser-induced breakdown spectroscopy
plasma
emission spectrum
