  Recent calculations [Nilsen et al. arXiv:1212.5972] predict that
contributions to the scattered photon spectrum from 3s and 3p bound states in
chromium (Z=24) at metallic density and T=12 eV resonate below the respective
bound-state thresholds. These resonances are shown to be closely related to
continuum lowering, where 3d bound states in the free atom dissolve into a
resonant l=2 partial wave in the continuum. The resulting d-state resonance
dominates contributions to the bound-free dynamic structure function, leading
to the predicted resonances in the scattered X-ray spectrum. Similar resonant
features are shown to occur in all elements in the periodic table between Ca
and Mn (20 <= Z <= 25).
