Figure 4.

Comparison of the O₂ dissociative sticking probability as a function of incident angle (α) for helicopter and cartwheel orientations obtained from this work (left panel, E_t = 0.15 and 0.23 eV) and experiment³⁰ (right panel, E_t = 0.10 and 0.18 eV). The difference between experimental and theoretical translational energies accounts for the overestimation of the barrier by roughly 0.05 eV by theory. The incident plane is directed to the [111] (112̅]) direction of the Al(111) surface. The dashed lines correspond to the normal energy scaling curves derived from the translational dependence of S₀ with normal incidence.