Table of Contents
Laser Chemistry
Volume 20, Issue 2-4, Pages 111-122
http://dx.doi.org/10.1080/02786270215155

Temporal Characterization of a Plasma Produced by Interaction of Laser Pulses with Water Solutions

1Laboratoire de Spectroscopie Atomique, Moléculaire et Applications Faculté des Sciences de Tunis, Université El Manar, Tunis, Tunisia
2Laboratoire de Photophysique Moléculaire du CNRS, Bât 210–Université Paris, Orsay XI 91405, France

Received 12 September 2002

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 of CaCl2, 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 Te using a Saha-Boltzmann analysis. The broadening of the resonance line of CaI at 4227 Å was used to deduce the electronic density Ne, with the aid of the semiclassical theory of Stark broadening. A value of Te ≈ 28000 K decreasing slightly to 21000 K, and an exponential decay for Ne were found, with Ne ≈ 1:25 × 1018cm-3 at 500 ns and τe=(1200±50) ns.