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Using Embedded-Atom Method (EAM) to Simulate Interaction of Intense Laser with Lead in LIBS

In this paper, we represented our numerical results on LIBS (laser-induced breakdown spectroscopy) process in Lead, excited by intense laser pulses. We used the EAM scheme and the proposed potential form for Lead in molecule dynamics simulation of the ablated process without taking into account the complex solid-liquid-gas phase transition process, which can greatly simplify phase variation of Lead and provide good insight into energies of dislodged ions and crater formation. In our work, we mainly focused on the crater morphology during the laser ablation process, and made comparison of erosion processes for different pulse durations. For the plasma emission, we used statistical method to study the energy distribution of the jetted Lead ions and analyzed the its relevance with the spectral line intensity of Lead, which contributed to the characteristic 406-nm peak of Lead.