Fig. 9. Excitation spectra from room temperature solutions containing Eu³⁺ (top) and Cm³⁺ (bottom) dissolved in HOTf_(aq) (0.11 M, black trace) and (NH₄)O₂CMe_(aq):HO₂CMe_(aq) buffered solutions (0.1 M green trace, 4 M blue trace, 15 M pink trace, pH = 5.5).