Quantum tunnelling becomes more probable the smaller the mass of the cation is, and the proton is the lightest possible stable cation, thus there is a minor effect from quantum tunnelling also, although it dominates at low temperatures only.
Quantum tunnelling becomes more probable the smaller the mass of the cation is. The proton is the lightest possible stable cation. There is a minor effect from quantum. This quantum is tunnelling also. It dominates at low temperatures only.