等离子体羽中氧原子的光谱强度分布  

Spectral Intensity Distribution of Oxygen Atom in a Plasma Plume

作　　者：李雪辰[1] 贾鹏英[1] 袁宁[1] 杨宝柱[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《光谱学与光谱分析》2012年第4期890-892,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(10805013;51077035);教育部重点科技项目(210014);河北省自然科学基金项目(A2009000149;A2011201132);河北大学杰出青年项目(J2010-02);河北省教育厅优秀青年基金项目(Y2011120)资助

摘　　要：大气压等离子体羽放电产生的低温等离子体由于不需要真空装置,可以对复杂材料进行三维处理等,在工业上具有广泛的应用前景。本工作利用等离子体针放电装置在大气压空气中产生了稳定的等离子体羽。通过光谱测量,发现等离子体羽发射谱中存在777.5和844.6nm的氧原子谱线。这表明在大气压空气放电中产生了具有高化学活性的氧原子。通过光谱学方法研究了氧原子谱线强度的空间分布,发现靠近电极处氧原子谱线强度远大于其他位置。为了对这一现象进行解释,利用光电倍增管对等离子体羽的发光信号进行了空间分辨测量,发现靠近电极处发光信号宽度远大于其他位置的发光信号宽度。这些结果对大气压空气等离子体羽在杀菌消毒等领域的应用具有重要意义。Low temperature plasma generated in plasma plume discharge at atmospheric pressure has prosperous application fields in industry because the vacuum device can be dispensable and some complex materials can be treated in three dimensions by this plasma plume. A stable plasma plume was generated in atmospheric pressure air in the present paper by using a plasma needle discharge device. It was found by spectral measurement that there are some spectral lines emitted from oxygen atom such as 777.5 and 844.6 nm in the optical emission spectra of the plasma plume. This phenomenon indicates that oxygen atom with high chemical activity was generated in the air discharge at atmospheric pressure. The spatial distribution of the spectral intensity from the oxygen atom was investigated by spectroscopic method. Results show that the spectral intensity from oxygen atom near the needle electrode was much higher than that in other regions. In order to explain this experimental pheno^nenon, spatial-resolved signals emitted from the plume were detected by using photomultiplier tubes. It was found that the width of light pulse near the needle electrode was much bigger than that in other regions. These results are important for the application of plasma plume in industry such as sterilization and disinfection fields.

关 键 词：等离子体羽 光谱法 空间分布 发光信号 杀菌消毒 

分 类 号：O461.2[理学—电子物理学] O433.4[理学—物理]