Figure 2.

(A) Experimentally determined anomalous dispersion correction f′(E) for Rb as a function of incident X-ray energy near the Rb K-edge (see also Figure S2A,B). (B) Model SAXS intensity calculations of the nonresonant term (black) and the magnitude of the resonant (at E = E_K – 5 eV) term (red) in eq 1. The positions of the sharp minima that are exclusive to the resonant term magnitude correspond to the q values where v(q) changes sign (inset, blue).