An approach to the ejection mechanisms of Li atoms from pulsed excimer laser ablation of a LiNbO3 target

Abstract

A nonequilibrium kinetic model is used for predicting the time evolution of the Li atom concentrations (ground and excited states) in the plasma produced by excimer laser ablation of a LiNbO3 target. The model predicts a very high ionization degree ([similar]0.97) that agrees well with the one obtained experimentally ([similar]1). These results together with the prediction of high (and close to local thermodynamic equilibrium) population densities of the electronically excited Li upper energy levels provide an indirect support for an electronic rather than thermal ablation mechanism of Li atoms. © 2002