Self-absorbed lines analysis of a recombining laser nduced metallic plasma

摘要

During the recombination of a plasma produced by a nanosecond laser impact on an aluminiumalloy target,some spectral lines of Al I and Al II exhibit self-absorption.These experimentalshapes have been successfully compared at different locations and time delays with the onesderived from the self-consistent resolution of the general radiative transfer equation (RTE).So,theevolution of the spatial distribution of the involved population densities (electron,upper and lowerstates of the transitions)is obtained without any equilibrium hypothesis.A collisional-radiativemodel is currently elaborated with the aim of explaining the recombining phase of the plasmaunder different pressure conditions.