Figure 14.

Mean escape time and mean travelling distance of a molecule within cavities of different geometries. (a,b) Gradient of the mean escape time and the mean distance that a molecule travels in the cavity before it escapes with different entrance-escape holes is diverging for very small size cavities (1, 10 nm); (c,d) mean escape time and the travelling distance gradients are constant for large size cavities (10², 10³ nm), suggesting a non-thermal equilibrium state and large fluctuations for small size cavities.