A model of plasma expansion with chemical kinetics has been developed and compared with the free-flow model describing the laser ablation plume of metallic titanium target. Optical emission spectroscopy has been used to obtain time of flight (TOF) spectra. The measured shift between Ti and Ti + TOF has been theoretically explained on the basis of the recombination process. Particular attention has been also focused on the dependence of TOF on some plume parameters such as initial speed, temperature, pressure, and plume extension.
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Casavola et al. (2003) studied this question.
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