Fig. 6.

The post-photodissociation TRIR transient absorbance trace recorded at the maximum of the Fe_a3–CO absorbance peak at 1974 cm⁻¹ (filled circles) and the ${\text{Cu}}_{\mathrm{B}}^{+}-\text{CO}$ absorbance peak at 2053 cm⁻¹ (open circles).