A combined fluid dynamic and chemical model to investigate the laser induced plasma expansion

In this paper a theoretical model to study the time and space evolution of the plasma generated during the interaction between a KrF laser and a Ti surface has been developed. An optimisation of the initial parameters in the continuous evaporation approximation, such as temperature (T₀), rate production of matter (z_d), velocity (v₀) and ionization degree (), has been carried out to reproduce the experimental profiles obtained by time and space resolved laser induced plasma spectroscopy. The best initial conditions have been found by Downhill simplex method and their effects on the plasma evolution have been discussed. PACS 47.70.Fw; 52.25.Dg; 52.38.Mf; 82.20.Wt