Health is wealthSurface Diffusion
Surface Diffusion is a general process involving the motion of adatoms, molecules and adaparticles at solid material surfaces. Adatoms are nothing but adsorbed atom lying on a crystal surface, used in surface chemistry, when describing single atoms lying on surfaces and surface roughness. Adaparticles are nothing but atomic clusters. Tunneling diffusion is a particularly interesting example of an unconventional mechanism wherein hydrogen has been shown to diffuse on clean metal surfaces via the quantum tunneling effect.
