Diagnostics of inhomogeneous plasmas: correction coefficients of the self-absorption and of the effect of spatial inhomogeneity

摘要

A plasma spatial distribution model for a cylindrical geometry was developed to study the dependence of the spectral lines in the plasma emission spectra on plasma inhomogeneity and on the self-absorption effect. In this work, we consider a particular spatial distribution of a plasma. This distribution has allowed us to establish new correction coefficients of spectral lines on the self-absorption effect and to consider the media inhomogeneity effect. These coefficients are then used to analyse experimental spectral lines of emission of a single laser breakdown in an underwater medium. A spatial and time resolved spectroscopic method was used to study the spectrum. For the electron temperature and electron density measurements, trace impurities of Ca and K are added to the water.