Density and x-ray emission profile relationships in highly ionized high-Z laser-produced plasmas.

We present a benchmark measurement of the electron density profile in the region where the electron density is 10¹⁹cm^-3 and where the bulk of extreme ultraviolet (EUV) emission occurs from isotropically expanding spherical high-Z gadolinium plasmas. It was found that, due to opacity effects, the observed EUV emission is mostly produced from an underdense region. We have analyzed timeresolved emission spectra with the aid of atomic structure calculations and find the multiple ion charge states around 18+ during the laser pulse irradiation. [ABSTRACT FROM AUTHOR]