An Investigation of Enhanced Laser-Induced Spark Emission and Material Ablation Following Sequential Laser PulseExcitation

连续激光脉冲激发后增强激光诱导火花发射和材料烧蚀的研究

• 批准号: 0316069
• 负责人: Stanley Angel
• 金额: $ 33万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0316069&HistoricalAwards=false
• 关键词: Investigation; Enhanced; Laser; Induced; Spark

Professor Stanley Angel of the University of South Carolina is supported by the Analytical and Surface Chemistry program in a collaboration with Dr. A. DeGiacomo of the University of Bari, Italy. Through experiments and theory, the team is studying the mechanism of an atomic analytical method, laser-induced breakdown spectroscopy (LIBS), in order to improve LIBS as a technique capable of analyzing solids without sample preparation. Particularly, a dual pulse sequence has resulted in 100-fold enhanced LIBS, but the mechanism for the enhancement, larger plasma volume, lower continuum background and increased electron temperature are not known. Systematic studies will be conducted to test the hypothesis that the effects are due to plasma re-heating and pre-ionization above the sample. For example, the team will attempt to duplicate dual-pulse results by creating a pre-ionized region using glow discharge. Four elements, Al, Fe, Cu and Cr, in three sample matrices (glass, steel and pure metals) will be studied as model systems.Applications include environmental, health, forensic, geological and industrial analysis. The work will enable students to interact with international scientists as well as staff at the Lawrence Livermore National Laboratory.

南卡罗来纳州大学的Stanley Angel教授与A.意大利巴里大学的德贾科莫说。 通过实验和理论，该团队正在研究原子分析方法激光诱导击穿光谱（LIBS）的机理，以改进LIBS作为一种能够在不制备样品的情况下分析固体的技术。 特别地，双脉冲序列导致100倍增强的LIBS，但增强的机制，更大的等离子体体积，更低的连续背景和增加的电子温度是未知的。 将进行系统研究，以检验效应是由于样品上方的等离子体再加热和预电离所致的假设。 例如，该团队将尝试通过使用辉光放电创建预电离区域来复制双脉冲结果。 四种元素，铝，铁，铜和铬，在三个样品基质（玻璃，钢和纯金属）将作为模型系统进行研究。应用包括环境，健康，法医，地质和工业分析。这项工作将使学生能够与国际科学家以及劳伦斯利弗莫尔国家实验室的工作人员进行互动。