Figure 3.

The entropy of binding and its parts for a diatomic binding model according to the RRHO approximation. The entropy of binding in the FM approach is also shown for comparison. As also labeled in the figure, from top to bottom on the left axis the graphs are: ΔS_{RRHO, r}; ΔS_{RRHO, vib} in the quantum and classical formulations, respectively; $\mathrm{\Delta }{S}_{\text{RRHO}}^{\circ }$ in the quantum formulation; $\mathrm{\Delta }{S}_{\text{t}}^{\circ };\mathrm{\Delta }{S}_{\text{RRHO}}^{\circ }$ in the classical formulation; and $\mathrm{\Delta }{S}_{\text{RRHO},\text{t}}^{\circ }$. The results are derived in Subsection 2.2 of Supporting Information.