Kisliuk Adsorption Model
Precursor Assisted Adsorption
Rule One
Rule Two
Due to the presence of extrinsic and/or intrinsic precursor states, the adsorption probability can become independent of the surface coverage. Particles trapped above occupied surface sites (extrinsic precursor state) or above bare surface sites (intrinsic precursor state) can migrate along the surface thereby finding empty sites irrespective of the vacancy of the initial point of impact.