Abstract Experimental and theoretical investigations were performed on transient plasmas generated by ns-laser ablation on ten mineral samples. Space-and time-resolved optical emission spectroscopy and ICCD fast camera imaging were implemented to understand the kinetics of the ablated particles and how the samples physical properties can be reflected by those of the plasma plume. Strong correlations were found between the global and individual plasma velocity and the melting temperature of the geomaterials. The thermal energy of the plasma expressed through the excitation temperature of the ejected particle is correlated with the same target physical parameter, results corelated with the presence of strong thermal ejection mechanisms. To better understand the global empirical laws, we implemented the fractal model to interpret the results. The model manages to emulate the target-plasma correlations using a multifractal hydrodynamic approach and adequately calibrating the theoretical model on the empirical tools used to describe the laser produced plasmas.

中文翻译：

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对各种地质样品上 ns 激光产生的等离子体的空间和时间分辨光学研究

摘要 对 ns 激光烧蚀在 10 个矿物样品上产生的瞬态等离子体进行了实验和理论研究。实施了空间和时间分辨光学发射光谱和 ICCD 快速相机成像，以了解烧蚀粒子的动力学以及等离子体羽流的物理特性如何反映样品的物理特性。在全球和单个等离子体速度与地质材料的熔化温度之间发现了很强的相关性。通过喷射粒子的激发温度表示的等离子体的热能与相同的目标物理参数相关，结果与强热喷射机制的存在相关。为了更好地理解全局经验法则，我们实施了分形模型来解释结果。