Fig. 6. The background-subtracted and normalized Ho L3-edge XANES measurements obtained from HoIII(C5H4SiMe3)3 (black dashed trace), [K(2.2.2-cryptand)][HoII(C5H4SiMe3)3] (pink dashed trace) complexes, and a mixture of HoIII and HoII samples (green dashed trace). Second derivatives of the data are provides as solid traces. Note the pre-edge features (labeled with a red arrow) that are manifested as a minimum in the 2nd derivative.
