Temporal Characterization of a Plasma Produced by Interaction of Laser Pulses with Water Solutions
The temporal evolution of a plasma formed by the interaction of a Nd-YAG 10 ns laser pulse with the surface of aqueous solutions of , has been observed by analyzing the variation of the emission spectra of ions and neutral atoms in the time interval after the laser pulse, 500 ns < t < 5000 ns. The intensity measurements of the lines of CaII at 3158 Å, 3179 Å, 3706 Å, 3736 Å, 3933 Å, 3968 Å were used to obtain the electronic temperature using a Saha-Boltzmann analysis. The broadening of the resonance line of CaI at 4227 Å was used to deduce the electronic density , with the aid of the semiclassical theory of Stark broadening. A value of ≈ 28000 K decreasing slightly to 21000 K, and an exponential decay for were found, with ≈ 1:25 × at 500 ns and ns.
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