文档介绍：沈阳理工大学
硕士学位论文
激光在原子发射光谱分析中的应用研究
姓名:李倩
申请学位级别:硕士
专业:物理电子学
指导教师:徐送宁
2011-03
沈阳理工大学硕士学位论文
摘要
原子发射光谱分析是对元素进行定性和定量分析的应用最广泛的方法。与现
有的其他光谱分析技术相比,激光应用于原子发射光谱分析可以做到近似无损分
析,在分析难蒸发、难激发元素方面也有其独特的优势。激光等离子体的相关研
究在薄膜制备、同位素分离、医学、生物学等方向都有着较好的应用前景。目前
激光应用在原子发射光谱分析中多采用红外激光,且相关分析多是理论性分析或
定性半定量分析,紫外激光的应用及光谱定量分析的相关研究还相对较少。
本文介绍了原子发射光谱分析的相关原理,激光等离子体的形成过程和光谱
特点,摄谱法定量分析的过程和方法。利用微型光纤光谱仪实现了电弧纯铜等离
子体的原子发射光谱的实时测量,得出其激发温度与激发时间的相对关系,得出
电弧引燃 30s 后等离子体温度相对稳定。利用光栅光谱仪拍摄激光激发的纯铜等离
子体原子发射光谱,确定实验条件。在选定的实验条件下采集激光激发的 HPb59-1
铅黄铜样品的等离子体原子发射光谱,分析了 XeCl 准分子激光诱导击穿铅黄铜合
金光谱的谱线加宽线形。做出定量分析工作曲线,并计算了样品中 Ni、Fe 元素含
量的定量分析精密度。
研究结果表明将紫外激光应用于原子发射光谱分析中是可行的,并且能够提
高定量分析的最小取样量水平。
关键词:激光诱导,等离子体,原子发射光谱,定量分析
沈阳理工大学硕士学位论文
Abstract
The Atomic Emission Spectroscopy is the most widely application method of
qualitative and quantitative analysis of element. Comparing with other spectroscopy
analysis technology, the atomic emission spectroscopy of laser is nearly nondestructive
analysis, and has unique advantages in the analysis of the element which is hard to
evaporate and stimulate. The research of laser plasma prehensive application
foreground in film preparation, laser isotope separations, medicine and biology. At
present, the atomic emission spectroscopy of laser used infrared laser most, and the
related analysis were always theoretical, semi-quantitative, qualitative analysis. The
research about the application of ultraviolet laser and quantitative analysis was very
little。
The principles of the atomic emission spectroscopy , the formative process , the
spectral characteristics, the processes and methods of quantitative analysis by
spectrography were given. The real-time atomic emission spectrum of the arc plasma
(Cu) has been measured by micro-fiber optic spectrometers. The relation of the
excitated temperature and time was obtained. The excitation temperature of the arc
plasma paratively stable after the arc has been ignited about thir