Fig. 3. k ³-Weighted room temperature Ac³⁺ and Cm³⁺ L₃-edge EXAFS spectra displaying the χ(k) function (points) with non-linear curve fitting (lines) from Ac³⁺ dissolved in (NH₄)O₂CMe_(aq):HO₂CMe_(aq) (15 M and 0.2 M, pH = 5.5) solutions and from Cm³⁺ dissolved in (NH₄)O₂CMe_(aq):HO₂CMe_(aq) (15 M, 4 M, 0.1 M, pH = 5.5) solutions.