Abstract
We report on the analysis of time-resolved x-ray spectra from direct-drive, Ar-filled polymer shell implosion experiments in which we trace the time evolution of the electron density through stagnation. Very high electron densities in the range 2--8/times/10/sup 24/ cm/sup /minus/3/ are inferred. We also discuss several novel spectral features, including large Stark broadening of satellite line emission, optical thicknesses for resonant transitions lower than expected, and the onset of density-dependent ''blue satellites'' on the high-energy wing of the He/sub /alpha// line.
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