Plasma-laser radiation interaction during dual-pulse laser ablation of metals and alloys

Abstract

It was determined that the transition from single-pulse to double-pulse laser ablation at constant energy and radiation power leads to a significant increase in the analytical signal, plasma temperature and the speed of thermal motion of copper atoms, both when exposed to pure copper and copper-based alloys. From the obtained values we can conclude that the different temperatures and thermal velocities of particles for samples of copper, bronze and brass, we can say that the plasma has spatial and temporal inhomogeneity. From this we can conclude that the heterogeneity of a multicomponent plasma leads to a violation of local thermodynamic equilibrium, which in turn can affect the error of quantitative analysis, especially when using calibration-free methods