Characterization of laser-induced plasmas under simulated conditions of selected celestial bodies

选定天体模拟条件下激光诱导等离子体的表征

• 批准号: 511798845
• 负责人: Dr. Igor B. Gornushkin, Ph.D.
• 金额: --
• 依托单位: Abteilung 1: Analytische Chemie, Referenzmaterialien
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/511798845?language=en
• 关键词: Characterization; laser; induced; plasmas; under

The exploration of near celestial bodies represents a persisting interest for various techniques/research fields. This involves geological survey, particularly the elemental analysis of surface of, e.g., Mars, Moon and even of asteroids. For this purpose, various strategies were developed, among which the laser-induced breakdown spectroscopy (LIBS) technique has proven itself as one of the most convenient approaches. The utilization of LIBS in remote and even stand-off applications is enabled from its essence, focusing a laser pulse on the sample surface, ablating a fraction of the target material, inducing a plasma, and collecting its optical emission for further spectroscopic investigation. However, laser-matter interactions and the consequent laser ablation is significantly influenced by physical/chemical matrix effects of the examined sample and experimental parameters, incl. the ambient conditions (buffer gas in laboratory, atmosphere, or ultra-high vacuum on celestial body surface) on the considered celestial bodies. To provide reliable LIBS analysis, it is mandatory to understand the processes of ablation, plasma formation and its evolution. The main scope of the project is to describe mentioned processes with respect to the ambient conditions of said celestial bodies. The novelty of the project can be summarized as follows. A) Novel approaches in the correlation of characteristics signals (e.g., showing plasma shape and heterogeneity, speed of the shockwave expansion) for more accurate description (e.g., temperature and electron density distributions within the plasma bulk) of spatial-temporal evolution of LIP model and their comparison with numerical models. B) A machine-learning based approach enabling the transfer of the LIBS data obtained under Earth-like conditions to Mars- and Moon-like conditions that goes beyond the current state of the art. C) Innovative application of time-resolved FTIR spectrometry for LIP characterization that provides detailed information about the atomic and molecular species forming in the ablation plasma (with ability to resolve the rotation vibration transitions of multiple overlapping molecular bands as well as the hyperfine structure of atomic spectral lines). D) Plasma model that accounts for chemical transformations in the plasma plume and allows the prediction of plasma emission spectra, which are directly comparable to experiment, is unique and novel. It will allow the optimization of complexly intertwined experimental parameters without making tedious and time-consuming optimization experiments.

近天体的探索代表了各种技术/研究领域的持续兴趣。这涉及地质调查，特别是表面的元素分析，例如，火星，月球，甚至小行星。为此，开发了各种策略，其中激光诱导击穿光谱（LIBS）技术已被证明是最方便的方法之一。LIBS在远程甚至远距离应用中的利用是从其本质上实现的，将激光脉冲聚焦在样品表面上，烧蚀一部分目标材料，诱导等离子体，并收集其光发射用于进一步的光谱研究。然而，激光-物质相互作用和随之而来的激光烧蚀显着影响的物理/化学基质效应的检查样品和实验参数，包括。所考虑天体的环境条件（实验室中的缓冲气体、大气或天体表面的超高真空）。为了提供可靠的LIBS分析，必须了解消融，等离子体形成及其演变的过程。该项目的主要范围是描述与所述天体的环境条件有关的上述过程。该项目的新奇可概括如下。A）特征信号（例如，显示等离子体形状和不均匀性、冲击波膨胀的速度）以进行更准确的描述（例如，温度和电子密度分布）的时空演化的LIP模型和它们与数值模型的比较。B）一种基于机器学习的方法，能够将在类似地球的条件下获得的LIBS数据转移到类似火星和月球的条件下，这超出了目前的技术水平。C）时间分辨FTIR光谱法在LIP表征中的创新应用，提供了有关消融等离子体中形成的原子和分子种类的详细信息。（具有分辨多个重叠分子带的旋转振动跃迁以及原子光谱线的超精细结构的能力）。D）解释等离子体羽流中的化学转化并允许预测等离子体发射光谱的等离子体模型是独特和新颖的，其与实验直接可比。它将允许复杂的相互交织的实验参数的优化，而无需进行繁琐和耗时的优化实验。