Using EAM to simulate interaction of intense laser LIBS in lead

In this paper, we represent our numerical results on LIBS (laser-induced breakdown spectroscopy) process in Lead, excited by intense laser pulses. We used the EAM (embedded-atom method) scheme and the proposed potential form for Lead in molecule dynamics simulation of the ablated process. By treating the temperature rise in the solid phase and the plasma plume formation differently, we could largely simplify the phase transition of Lead and provide good insight into processes such as temperature distribution, energies of dislodged ions and crater formation and so on. 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 its relevance with the spectral line intensity of Lead, which contributed to the characteristic 406-nm peak of Lead. Finally, we discussed our experimentally measured results for Lead in LIBS ablated by ns-pulsewidth laser pulses and represented the ablation scenario for Lead under ns-pulse excitation.