Fig. 8. (a) Structural model of Z[Cu^IINO₃] sites in 8r, indicating the different scattering contributions employed in the fit for Cu-CHA 0.6_29 exposed to the NO/O₂ mixture. Atom colour code: O, red; N, blue; Al, yellow; Si, grey; and Cu, green. The atoms included in the fitting model are shown in ball-and-stick mode, while the others are visualized in stick mode. (b, c) Phase uncorrected (b) modulus and (c) imaginary part of the experimental and best fit FT EXAFS spectra for Cu-CHA 0.6_29 exposed to the NO/O₂ mixture. The experimental data are shown as black open circles and the best fits with red solid lines. The principal SS and MS contributions included in the fitting model are reported as coloured solid lines, vertically translated for the sake of clarity.