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Abstract

We present measurements of the spectrally resolved x rays emitted from solid-density magnesium targets of varying sub-${\mu}\mathrm{m}$ thicknesses isochorically heated by an x-ray laser. The data exhibit a largely thickness-independent source function, allowing the extraction of a measure of the opacity to $K$-shell x rays within well-defined regimes of electron density and temperature, extremely close to local thermodynamic equilibrium conditions. The deduced opacities at the peak of the $K{\alpha}$ transitions of the ions are consistent with those predicted by detailed atomic-kinetics calculations.

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