Temporal behavior of neutral and ionic lines emitted from a laser induced plasma on an aqueous surface

The temporal behavior of spectral lines emitted from a laser induced plasma has been studied. The plasma was created by using a Nd:YAG pulsed laser in air at atmospheric pressure focused on the surface of an aqueous solution. This work is an extension of previous published work [J. Ben Ahmed, Z. Ben Lakhdar, G. Taieb, Kinetics of laser induced plasma on an aqueous surface, Laser chem. 20 (2002) 123-134.]. The time evolution of lines intensities emitted from Ca, Ca+, Mg and Mg+ has been experimentally observed and simulated using a simple theoretical approach based on electron-ion recombination. It was shown that the plasma temperature and electron density are correlated to the dynamics of plasma emission. Finally, the time evolution of the optical depth of Ca+ resonance line at 393.4 nm was also studied.