Temporal Characterization of a Plasma Produced by Interaction of Laser Pulses with Water Solutions. Issue 2 (2002)

• Record Type: Journal Article
• Authors: Ben Ahmed, J.; Terzi, N.; Ben Lakhdar, Z.; Taieb, G.
• Is Part Of: Laser chemistry. Volume 20:Issue 2/4(2002)
• Page Start: 111
• Page End: 122
• Publication Date: 2002
• Subjects: Lasers in chemistry -- Periodicals; 542.8
• DOI: 10.1080/02786270215155
• Languages: English
• ISSNs: 0278-6273

Abstract

Abstract : The temporal evolution of a plasma formed by the interaction of a Nd-YAG 10 ns laser pulse with the surface of aqueous solutions ofCaCl 2, 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 Ca II at 3158 Å, 3179 Å, 3706 Å, 3736 Å, 3933 Å, 3968 Å were used to obtain the electronic temperatureT e using a Saha-Boltzmann analysis. The broadening of the resonance line of Ca I at 4227 Å was used to deduce the electronic densityN e, with the aid of the semiclassical theory of Stark broadening. A value ofT e ≈ 28000 K decreasing slightly to 21000 K, and an exponential decay forN e were found, withN e ≈ 1:25 ×10 18 cm -3 at 500 ns andτ e = ( 1200 ± 50 ) ns.