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Aimed at solving the outstanding problem of solar opacity, and radiationtransport plasma models in general, we report substantial photoabsorption inthe high-energy regime due to atomic core photo-excitations not heretoforeconsidered. In extensive R-Matrix calculations of unprecedented complexity foran important iron ion Fe xvii (Fe$^{16+}$), with a wave function expansion of99 Fe xviii (Fe$^{17+}$) LS core states from $n \leq 4$ complexes (equivalentto 218 fine structure levels), we find: i) up to orders of magnitudeenhancement in background photoionization cross sections, in addition tostrongly peaked photo-excitation-of-core resonances not considered in currentopacity models, and ii) demonstrate convergence with respect to successive coreexcitations. The resulting increase in the monochromatic continuum, and 35% inthe Rosseland Mean Opacity, are compared with the "higher-than-predicted" ironopacity measured at the Sandia Z-pinch fusion device at solar interiorconditions.

Large enhancement in high-energy photoionization of Fe XVII and missing continuum plasma opacity