FIG. 6.

The time dependence of the irreversible rate coefficients $k_{\text{rate}}^{\rho =\Theta }\left(t\right),k_{\text{rad}}\left(t\right)$ according to the area (solid lines, Eq. (A3)) and contact reactivity model¹⁶ (dashed lines), respectively. The encounter radius is a = 1. The other parameters are for the top left panel: κ_r = 10, D = 0.25, top right panel: κ_r = 1, D = 0.25, bottom left panel: κ_r = 10, D = 2.5, bottom right panel: κ_r = 1, D = 2.5. To relate the parameters κ_a and κ_r, we set κ_a = πa²κ_r.