RUI: Elucidation of Matrix Effects in Laser Ablation Elemental Analysis through Absolute Quantification of Ablated Mass

RUI：通过烧蚀质量的绝对定量阐明激光烧蚀元素分析中的基体效应

• 批准号: 1905301
• 负责人: Jonathan Merten
• 金额: $ 48.9万
• 依托单位: Arkansas State University Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905301&HistoricalAwards=false
• 关键词: RUI; Elucidation; Matrix; Effects; Laser

With support from the Chemical Measurement and Imaging Program in the Division of Chemistry, and co-funding from the Established Program to Stimulate Competitive Research (EPSCoR), Professor Jonathan Merten and his group at Arkansas State University are pursuing research that aims to make the measurement of the chemical elements around us easier, faster, cheaper and "greener." Elemental analysis is important to many fields, including geologic exploration, electronics, manufacturing, agriculture, energy, defense, and health. Typically, the measurement requires that the sample be dissolved in expensive and powerful acids before measurement, a process that can take hours and generates chemical waste with high costs for safe disposal. The Merten group seeks to improve understanding of alternative laser-based methods which are safer and much faster. Specifically, they direct pulsed lasers at samples to generate tiny plasmas hotter than the surface of the sun. Through better control and understanding of the plasma formation process, they are working to improve the laser-based measurements. Dr. Merten and his undergraduate students are also reaching out to the Northeast Arkansas community through programs at the Arkansas State Museum, which serves a rural population in Northeast Arkansas from its location on the campus of Arkansas State University. This work has the potential to provide 5000 participatory interactions with the public using free-form laser-ablation experiments performed in a class I, safety-interlocked laser setup at the museum, increasing public knowledge of and interest in spectroscopy and improving the STEM pipeline. Laser-ablation (LA) analytical methods, including laser-induced breakdown spectroscopy (LIBS) and LA inductively coupled plasma analyses require little or no sample preparation and are rapid and (in the case of LIBS) portable. Unfortunately, they are extremely prone to matrix effects, which are difficult to understand because of the inhomogeneous plasma?s small size and rapid evolution. The Merten group has developed a technique that allows mapping of the LA plasma with high spatial and temporal resolution. By spatially mapping the atomic absorption spectrum, it is possible to calculate the mass of the gaseous plasma. This "spectral massing" procedure is being used to improve understanding of the post-ablation plasma directly and dynamically, thereby enhancing understanding of the ablation process and its relationship to the signal in elemental analysis methods. Such understanding of the total atomized mass and its stoichiometric development is critical for LA analytical methods.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学系化学测量和成像计划的支持下，以及既定的刺激竞争研究计划(EPSCoR)的共同资助下，阿肯色州立大学的乔纳森·默滕教授和他的团队正在进行旨在使我们周围的化学元素的测量更容易、更快、更便宜、更环保的研究。元素分析在许多领域都很重要，包括地质勘探、电子、制造、农业、能源、国防和卫生。通常，测量要求在测量之前将样品溶解在昂贵而强大的酸中，这一过程可能需要几个小时，并会产生高成本的化学废物，以便安全处置。Merten小组寻求提高对基于激光的替代方法的理解，这些方法更安全、更快。具体地说，它们将脉冲激光引导到样品上，产生比太阳表面更热的微小等离子体。通过更好地控制和了解等离子体形成过程，他们正在努力改进基于激光的测量。默滕博士和他的本科生还通过阿肯色州立博物馆的项目接触到阿肯色州东北部的社区，该博物馆位于阿肯色州立大学校园内，为阿肯色州东北部的农村人口提供服务。这项工作有可能通过在一级激光消融实验中进行的自由形式激光消融实验、博物馆的安全联锁激光装置、增加公众对光谱学的知识和兴趣以及改进STEM管道，与公众进行5000次参与性互动。激光烧蚀(LA)分析方法，包括激光诱导击穿光谱(LIBS)和LA电感耦合等离子体分析，只需要很少或根本不需要样品制备，而且快速且(对于LIBS)便携。遗憾的是，它们极易产生基质效应，而由于等离子体的不均匀，很难理解这些效应？S体积小，进化快。Merten团队已经开发出一种技术，可以以高空间和时间分辨率绘制LA等离子体图。通过对原子吸收光谱进行空间映射，可以计算出气体等离子体的质量。这种“光谱集结”程序正被用来直接和动态地提高对消融后等离子体的理解，从而在元素分析方法中增强对消融过程及其与信号的关系的理解。这种对总雾化质量及其化学计量发展的了解对洛杉矶分析方法至关重要。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Laser-ablation absorption spectroscopy: Reviewing an uncommon hyphenation

激光烧蚀吸收光谱：回顾不常见的连字符

• DOI: 10.1016/j.sab.2022.106358
• 发表时间: 2022
• 期刊: Spectrochimica Acta Part B: Atomic Spectroscopy
• 作者: Merten, Jonathan

Spectroscopic signatures and oxidation characteristics of nanosecond laser-induced cerium plasmas

纳秒激光诱导铈等离子体的光谱特征和氧化特性

• DOI: 10.1016/j.sab.2022.106610
• 发表时间: 2023
• 期刊: Spectrochimica Acta Part B: Atomic Spectroscopy
• 作者: Kwapis, Emily H.;Villa-Aleman, Eliel;Hartig, Kyle C.
• 通讯作者: Hartig, Kyle C.

Shock physics and shadowgraphic measurements of laser-produced cerium plasmas

激光产生的铈等离子体的冲击物理和阴影测量

• DOI: 10.1364/oe.483055
• 发表时间: 2023
• 期刊: Optics Express
• 影响因子: 3.8
• 作者: Kwapis, Emily H.;Hewitt, Maya;Hartig, Kyle C.
• 通讯作者: Hartig, Kyle C.

Experimental and computational investigation into the hydrodynamics and chemical dynamics of laser ablation aluminum plasmas

激光烧蚀铝等离子体的流体动力学和化学动力学的实验和计算研究

• DOI: 10.1039/d3cp01586f
• 发表时间: 2023
• 期刊: Physical Chemistry Chemical Physics
• 影响因子: 3.3
• 作者: Kwapis, Emily H.;Posey, Jacob W.;Medici, Enrique;Berg, Kira;Houim, Ryan W.;Hartig, Kyle C.
• 通讯作者: Hartig, Kyle C.

Following laser-induced plasma stoichiometry with atomic absorption spectroscopy

采用原子吸收光谱法进行激光诱导等离子体化学计量

• DOI: 10.1016/j.sab.2022.106600
• 发表时间: 2023
• 期刊: Spectrochimica Acta Part B: Atomic Spectroscopy
• 作者: Merten, Jonathan;Nicholas, Erin;Ethridge, Shawnda;Bariola, Hannah;Chestnut, Shealyn;Anders, Anna;Brees, Jackie;Foster, Mary
• 通讯作者: Foster, Mary