Figure 4.

(a) Motional simulations of the adsorbed CO₂ resonance (dotted black trace), and the corresponding analytical simulation (solid blue trace) acquired by fitting the VT ¹³C SSNMR spectra (Figure 3). The motional simulations were constructed using a C₃ rotation (b, left) and a C₂ jump (b, right) for the CO₂ dynamics. The angles α and β govern these two motions, and the corresponding values are provided in Table S10. Both motions occur at rates on the order of magnitude of ca. ≥10⁷ Hz in the studied temperature range.