A gas dynamical model is developed to study the plasma and the velocity and particle size distributions during laser ablation. The formation of plasma and the laser beam attenuation coefficient and ion concentration in the plasma are considered in the model. A droplet growth theory is used to determine the particle size distribution in the plasma. Nanosize particles are found to exist near the vaporization front. The velocity of the particles is found to be higher at the plasma boundary than that inside the plasma.
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